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P.I Performance Improver (API)

 P.I Performance Improver (API)
Product Code: API • Brand: AMSOIL

P.i. improves fuel mileage an average of 2.3% and up to 5.7%. Reduces emissions such as hydrocarbons (HC) up to 15%, carbon monoxide (CO) up to 26% and nitrous oxides (NOx) up to 17%. Restores power and performance. Reduces the need for costly higher octane fuel. (API)

Package sizes include:

12-oz. Bottle
12-oz. Bottles (case of 12)

See Pricing or Place an Order
MSDSData Sheet

Product Details

Product Description

Improves fuel mileage an average of 2.3% and up to 5.7%. Reduces emissions such as hydrocarbons (HC) up to 15%, carbon monoxide (CO) up to 26% and nitrous oxides (NOx) up to 17%. Restores power and performance. Reduces the need for costly higher octane fuel. Reduces noise from carbon rap and pre-ignition. Offers better vehicle drivability and smoother operation.

Untreated Fuel Leads to Poor Engine Performance

A vehicle demonstrates its best efficiency and engine performance when it is new. As the engine ages, its performance suffers from gasoline fuel-generated deposits that form on the fuel injectors, intake valves and combustion chamber. Additives are required to control deposit formation.

Today's fuels, however, lack sufficient treatments of either enough additives or high quality additives. Fuel system deposits result in the following:

• Lost fuel economy
• Lost power and poor throttle response
• Failed emission tests
• Poor drivability - surging, hesitation, stalling, rough idle
• Engine knocking (pinging) and rap
• Difficult starts

Treated Fuel Delivers Maximum Performance

AMSOIL P.i. is the most potent gasoline additive available today. As a concentrated detergent, it is unsurpassed in cleaning combustion chamber deposits, intake valve deposits and port fuel injector deposits. AMSOIL P.i. helps maintain peak engine efficiency, fuel economy, power and drivability in newer low mileage engines. In engines with accumulated deposits, testing showed AMSOIL P.i. provided the following clean-up benefits after only one tank of gasoline:

• Improves fuel mileage an average of 2.3% and up to 5.7%
• Reduced emissions

  • hydrocarbons (HC) up to 15%
  • carbon monoxide (CO) up to 26%
  • nitrous oxides (NOx) up to 17%
• Restored power and performance
• Reduced need for costly higher octane fuel
• Reduced noise from carbon rap and pre-ignition
• Better drivability
• Smoother operation

AMSOIL P.i. works as an "emissions passer." It is ideal for use prior to emissions inspections.

Unsurpassed Deposit Clean-up

Port Fuel Injector Deposits form after the engine has been shut down and there is no gasoline flowing through the injectors. During this "hot soak" period the injectors heat up and the gasoline remaining in the injectors degrades and forms deposits. This can happen very quickly with the use of poor quality gasoline and short trip driving. Because the clearances within the injectors are extremely tight and injectors must deliver precise amounts of "atomized" fuel, even small amounts of deposits can cause injectors to malfunction. Fuel flow is reduced and spray patterns are disrupted, decreasing engine efficiency, power and fuel economy, while increasing exhaust emissions.

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Intake Valve Deposits form on the intake side orback side of the valves. As deposits increase, theyrestrict airflow and alter airflow patterns in the cylinder.The deposits disrupt the balanced air/fuel ratio bymomentarily absorbing and releasing fuel, and they cancause valve sticking by getting in the way of the valvestem and guide. Deposits also restrict proper seating,and the valves may be burned. Intake valve depositscause lost engine power, increased emissions, poorengine efficiency and potential valve failure.

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Combustion Chamber Deposits form on the top of the pistonsand on the cylinder heads. They increase compressionand absorb heat during combustion to later release it duringthe intake cycle. In some engines with tight squish domes,combustion chamber deposits cause the piston to actually hitthe cylinder head. This is referred to as combustion chamberdeposit interference or “carbon rap.” Combustion chamberdeposits also flake off as they get large, and these flakes canget trapped between the valves and valve seat, resulting incompression loss, difficult starting and rough idle.

Higher compression and stored heat cause increased intakefresh charge temperatures and the increased likelihood ofpre-ignition “knock” or “pinging” when the fuel spontaneouslycombusts prior to spark ignition. This increases emissionsand may cause engine damage. Many of today’s cars have “knock” sensors that adjust spark timing to prevent knock.

Although audible knock is controlled, power is lost from retardedtiming. Higher octane fuels of 4-5 octane numbers can beused to help prevent knock, an effect called “octane requirementincrease.” As a vehicle ages, more expensive higheroctane fuel is needed to keep it operating at peak performance.By cleaning combustion chamber deposits, knock is controlled,power is restored, fuel economy increases and higheroctane fuels are less necessary for peak performance.

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Maximum Fuel Economy
AMSOIL P.i. maximizes fuel efficiency by dissolving and removingfuel system deposits and other contaminants for improvedpower and overall performance.

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Recommendations

Treat one full tank of gas up to 20 gallons with one bottle of P.i. For very large gas tanks, partially fill to 40 gallons and treat with two bottles of P.i. Using more than two bottles per treatment is not recommended. Treat gas every 4,000 miles or 100 hours of service. P.i. helps pass emission tests by running one tank of treated fuel through the engine prior to testing. Safe for use with catalytic converters, oxygen sensors, oxygenated gas and 10 percent ethanol blended gas. Not recommended for two-cycle engines.

DANGER: Combustible. Harmful or fatal if swallowed. Harmful if inhaled. Skin and eye irritant. Read precautions on container before use.

HEALTH & SAFETY

This product is not expected to cause health concerns when used for the intended application and according to the recommendations in the Material Safety Data Sheet (MSDS).

Click here to view the MSDS Data Sheet for AMSOIL API.

Keep out of the reach of children. Don't pollute. Return used oil to collection centers.

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 P.I Performance Improver (API)

Did this product meet your expectations?

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Product Name: P.I Performance Improver (API)
Current Rating: 4.89out of 5 stars
Votes & Reviews: 136 vote(s) and 139 user reviews.


A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Bruce: space

Clean up

Gas was slightly contaminated AMSoil straightened it all out.

Item Reviewed: P.I Performance Improver (API)
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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Blake: space

I buy this product with every oil purchase

I put this product in everything from my lawnmower equipment to my motorcycle to my turbo daily driver. I can see the improvement in fuel economy and the engines just run smoother. Also my lawn equipment's fuel system doesn't seem to get gummed up as often.

Item Reviewed: P.I Performance Improver (API)
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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Kevin: space

It's the best

I can tell a huge difference in my cars . Most other products I can not. I love Amsoil products!

Item Reviewed: P.I Performance Improver (API)
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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Boostedwrx: space

Great product

Great product love the performance and protection I getting from additive

Item Reviewed: P.I Performance Improver (API)
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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Desrah: space

Simply maintenance cues

I looked forward to using this product every 4500 miles in other to help maintain a clear and clogged free fuel line and filter system.

Item Reviewed: P.I Performance Improver (API)
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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Gaby: space

Loved the product

I purchased this product for my 2010 Honda Accord with the 3.5L VTECH engine on it. It is my daily driver and work vehicle. I do not not exactly what's my MPG's since the vehicle does not have the feature but I can tell you that I am using one quart of gas when before I was using half tank of gas in one week period just going and coming back from work. Also it is city driving. Loved the product.

Item Reviewed: P.I Performance Improver (API)
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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Tony: space

50/50

Satisfied with the purchase, but since I do a lot of city driving and fuel up every 2 days, not really sure if I improved my mileage.

Item Reviewed: P.I Performance Improver (API)
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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Jams: space

I would buy this product again.

I tried this product just this one time on a trip. I give it five stars because I was satisfied with it although I would need more time to fully test it.

Item Reviewed: P.I Performance Improver (API)
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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Dave: space

Extremely pleased with the noticeable results!

Used this priduct to clean fuel system on our Nissan Rogue. Instead of just 28mph, we now get 33mph.

Item Reviewed: P.I Performance Improver (API)
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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by mcf: space

This is a worthwhile part of maintenance for your engine

Whenever I'm off on a long trip I use this product and am now close to 200,000 kilometres and 10 years of use without any engine problems at all. My Toyota Tundra pickup is running like new.

Item Reviewed: P.I Performance Improver (API)
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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Ron from Kentucky: space

Instant tuneup

Adding this is as simple as it gets. My runs like it was new and the gets the gas mileage like it to. A bottle every 3 months works the best for me I'm my Ford Focus. Totally sold on this stuff.

Item Reviewed: P.I Performance Improver (API)
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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Rollin: space

Injection power that keeps your car running like new.

I used this product on my 01 lexus es300 at the begining of this year, and saw almost instant increase in lost power and accelaration reaction time. since then I've used it twice and everytime, Especially when used after or before using quickshot, my car always responds like new and my engine feels clean and responsive. It helps that I use only shell gas as well.

Item Reviewed: P.I Performance Improver (API)
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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Dave: space

I buy this a couple of times a year.

I use this in my Ford car once or twice a year to clean the fuel system.

Item Reviewed: P.I Performance Improver (API)
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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Singer of Songs: space

Amazing, just like everything at Amsoil.

I use this product religiously to keep my fuel system on my 2005 Ford F-150, in the best shape I can.

Item Reviewed: P.I Performance Improver (API)
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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Randy: space

Yes I would buy it again

I used it in the gas tank of my Volvo XC70 to help the engine run smoother, it sounded like water might be their, It works great.

Item Reviewed: P.I Performance Improver (API)
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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Alan: space

Highest quality of products.

I recommend Amsoil to anyone that wishes to take the best care of their vehicles. All that have tried the products, are completely satisfied, & they have said no other brand of products would be used in the future. Only Amsoil!

Item Reviewed: P.I Performance Improver (API)
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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Tom: space

I would buy this again

Works great

Item Reviewed: P.I Performance Improver (API)
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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by longhaul: space

insurance

I have used PI twice a year since the car was new and at 240,000 kilometers it idles smooth and has the same driving feel as new. I call that insurance.

Item Reviewed: P.I Performance Improver (API)
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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by tootall: space

Will buy product again

Use in all my gas powered equipment

Item Reviewed: P.I Performance Improver (API)
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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by mechanic: space

PI Performance

PI Performance works great added horse power and increase fuel millage.

Item Reviewed: P.I Performance Improver (API)
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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Mac: space

Best products on the market

I use all Amsoil products in both of my vehicles and have for years now. I will not use anything else in any of my vehicles.

Item Reviewed: P.I Performance Improver (API)
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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by HILTY: space

VERY GOOD

IN CAR, TRUCK, MOWERS

Item Reviewed: P.I Performance Improver (API)
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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Zman: space

Great product!

Improved my gas mileage & performance overall better running engine for sure

Item Reviewed: P.I Performance Improver (API)
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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Tim: space

This product keeps my motorcycles running great

The vehicles now a days cost a great deal of money to own and repair so I believe using Amsoil products is good insurance to keep my vehicles running good and avoiding repair costs.

Item Reviewed: P.I Performance Improver (API)
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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Jake: space

Works great

I use this product every six months. My 12.5 year old injectors were perfectly clean after inspection. I'd say it works great.

Item Reviewed: P.I Performance Improver (API)
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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by none: space

yes

It works.

Item Reviewed: P.I Performance Improver (API)
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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Silver Hair: space

Name says it all

The Performance Improver does just that. I have used it in a Kawasaki, three Hondas, and now an Indian. I can't see it working, but I can sure feel it.

Item Reviewed: P.I Performance Improver (API)
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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Mark the pipeliner: space

Keep a stock of this

I add to all of our vehicles every oil change to help keep the fuel system clean and at it's optimum.

Item Reviewed: P.I Performance Improver (API)
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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by CJ: space

Awesome Fuel System Tx.!

I utilize the additive about once q. 3 mo. and I can definitely tell the difference in my wife's '08 Honda Accord 3.5L V-6. The MPG increases on HWY by about 5%! Amsoil should come out with an affordable Ethanol Tx. which counteracts the decrease in MPG/Power of ethanol blend gasoline. We strictly utilize BP gasolines, yet there is still carbon build-up even with the additives they possess. Definitely worth the price to help keep the fuel system flowing smoothly!

Item Reviewed: P.I Performance Improver (API)
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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Jake: space

Try it

Makes a dramatic increase in fuel economy

Item Reviewed: P.I Performance Improver (API)
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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by mr jim: space

PI GAS ADDTIVE

PUT IT IN TWICE YEAR IN A FULL TANK.
AND NEVER HAD A PROBLEM STARTS GOOD
IN ANY WEATHER HOT & COLD WET OR DRY

Item Reviewed: P.I Performance Improver (API)
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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Butch: space

I'll be buying all AMSOIL products from now on.

I've used the products and can only hope they work as advertised and from on-line reviews. Right now the jury's still out.

Item Reviewed: P.I Performance Improver (API)
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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Monk: space

Just works

This always makes the car run more smooth and better feeling acceleration and general improvement overall

Item Reviewed: P.I Performance Improver (API)
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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by mobilemotormedic: space

NOT snake oil!

Hey! This stuff works! I'm able to monitor multiple points on engine performance as I'm driving. I can see the process of cleaning dirty injectors as I'm traveling down the road, and it does as advertised.

Item Reviewed: P.I Performance Improver (API)
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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Dan: space

All fuel systems should be cleaned.

All fuel systems should be cleaned from time to time as preventative maintenance. No matter how good your fuel is your system can get various deposits throughout it thus negatively affecting the fuel systems performance and fuel milage. This product lived up to its claims in my vehicle and will be used as needed in all of my vehicles.

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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Devolm: space

I'm going to buy more

I'm very happy with this product and will ordering more soon

Item Reviewed: P.I Performance Improver (API)
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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Subie Speedy: space

Addding performance to my Cars

I've been using AmsOil synthetic oil and oil filters for a while now on my cars and also add the P.I. gas additive now and then just to give it a boost. I noticed using the PI additive is much better than other similar products and I don't have to use them too often. Once or twice a year helps keep the cars performing.

Item Reviewed: P.I Performance Improver (API)
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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Charlie TUNA: space

Great product

Does what it says on the bottle!! Great product.

Item Reviewed: P.I Performance Improver (API)
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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Mikey: space

I have used this product for many years...

I have used this product for many years in all of my cars, trucks, and motorcycles. During that time I have never experienced a fuel-related problem. I get flawless engine performance, increased fuel mileage, and NO trips to the repair shop for dirty fuel injectors.

Item Reviewed: P.I Performance Improver (API)
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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by SHUZAAM: space

Best stuff you could buy.

Simply put it in your tank, fill it up with proffered gasoline, and drive off.
Cleans your system and improves mpg' garunteed. ITS ON THE BOTTLE.

Item Reviewed: P.I Performance Improver (API)
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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by AcuDoc: space

I would buy this product again

Boosted MPG

Item Reviewed: P.I Performance Improver (API)
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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by don't have one: space

PI Performance Improver

The product work as advertise nothing special, didn't see any great performance.

Item Reviewed: P.I Performance Improver (API)
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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by One Crank to Another: space

Keeps the old beater out of the shop

My old truck has needed new injectors for a few years, but the repair costs more than the vehicle. PI clears the check engine light and literally gets it firing on all cylinders again.

Item Reviewed: P.I Performance Improver (API)
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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Ron906: space

Keeps fuel for my Olds fresh.

I use this product all year in my two cars and truck. It keeps my fuel injection clean also the carb on my Olds. Great product.

Item Reviewed: P.I Performance Improver (API)
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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by ZH: space

Great product

Great product, really makes a difference in restoring engine performance.

Item Reviewed: P.I Performance Improver (API)
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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by wtrbxr: space

Works just as advertised

Used this in my 1999 ford f150 with 239,000 miles. Helped with a hard starting issue and seemed to smooth out my idle a bit. When I use this consistently my truck does not knock and ping on regular unleaded.

Will be using more consistently from now on.

Item Reviewed: P.I Performance Improver (API)
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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Chi: space

Would buy again and again

Great product

Item Reviewed: P.I Performance Improver (API)
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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by LGC driver: space

only use this product in my vehicles

Pour it in, fill the tank and go. Does everything else. I treat my gas every 7000 miles. No issues ever

Item Reviewed: P.I Performance Improver (API)
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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Dg: space

Great product

Just keep using this product because it works

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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by GRN: space

It works

I can see an increase in mileage.

Item Reviewed: P.I Performance Improver (API)
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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by mm: space

I use this product regularly

keeps my truck running great, cleans my fuel injectors improves my gas milage.

Item Reviewed: P.I Performance Improver (API)
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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Tu D Truong: space

I should use it for full performance

This product is very good keep my engine run smooth

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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by cam50cam: space

Great product

I recently added this to my 2016 Sequoia. Can notice a quicker throttle response and better running vehicle

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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Lipster: space

Much Better Than Expected

I bought a small bottle of P.I. to try it out. I used a little in my Harley, a small amount in my Camry and a small application in my S10 pickup which is approaching 300,000 miles.
In all three, the results were beyond just noticeable. Better performance, smooth application of power and very responsive.
I am a believer!

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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Hammer51: space

Hot Stuff and I will order more

I use it in my 2006 Mark LT when we go on trips and I believe we get about a mile more to the gallon. I have 120000 miles and have used Pi in the L T about four time back and forth to Ohio.

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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Mr. HoneyDo: space

Works just fine

Not sure how well it worked as I put it in the wife's car. She didn't complain about anything so it at least didn't make anything worse. I really like AMS products and this is another quality item. Will purchase again.

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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by None.: space

I will continue to use this product each year.I

I add this product when I fill up my gas tank once or twice a month. It negates the negative effects of the water in the gas, makes my vehicles run better and cleans.

Item Reviewed: P.I Performance Improver (API)
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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by PaPa Mike: space

Works as advertised!

Every time I use this additive my mpg always increase by 1 to1.5 ! I'm surprised at how even top tier gasoline can use extra cleaning for a better burn.

Item Reviewed: P.I Performance Improver (API)
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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Matt: space

can tell a difference

Used Amsoil PI in a number of cars and every time I use I get better gas mileage and better throttle response.

Item Reviewed: P.I Performance Improver (API)
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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Jerry Rumba: space

PI Fuel Maintenance

I have used this product in all my vehicles a few times a year at fuel fill-ups. I use top tier gasolines, but short drive habits and traffic congestion are problematic to deposit buildup. I product focuses on fuel system performance unlike so many that say you can put the same product in your gas tank and in your engine oil. That just sounds like bad plan.

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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Brent: space

This improved my mpg

I have a 2005 Chevy 3500 with a 6.0 L it was getting 6 mpg . Cleaned air filter and put this in tank it went to 12.6 mpg and on next fill up , I got 9.6 mpg (I did pull my trailer ) that week but will try the pi fuel additive again

Item Reviewed: P.I Performance Improver (API)
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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by D: space

Good Product I Will Use Again

I use this product in all of my vehicle

Item Reviewed: P.I Performance Improver (API)
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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Jay: space

Better than sea foam and cheaper

I used to use Sea foam, but this product is better and it is less expensive.

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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Suspension Jeff: space

Great product!

Pour in tank like it says! You'll get improved performance, vehicle runs smooth & great acceleration!

Item Reviewed: P.I Performance Improver (API)
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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Ed G.: space

Does a great job cleaning my injectors.

I have added a pint of this every 3 months for the past several years and my injectors have stayed clean. I have over 125,000 on my Camry and the mileage is the same as when I first got the car..

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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by grandka: space

Keep a supply on hand to use in my vehicles

seems to help quite a bit when I use it

Item Reviewed: P.I Performance Improver (API)
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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Mtnbiker: space

Great products

Putting this in my tank every 4k keeps my 2007 F150 running in top form.

Item Reviewed: P.I Performance Improver (API)
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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Rob: space

Smooth running.

I added it to the recommended amount of gas.

Item Reviewed: P.I Performance Improver (API)
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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Lycanit: space

Used regularly

No issue noted and no loss of mileage. I attribute that to regular use of PI. Strongly recommend

Item Reviewed: P.I Performance Improver (API)
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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Racerscott3: space

Been using since vehicle was new

2007 Envoy with 5.3 V8. Changed spark plugs at 110,000 mi. Looked excellent! No injector issues or fuel pump problems. Get 18 mpg regularly. All lubricants in this vehicle are Amsoil.

Item Reviewed: P.I Performance Improver (API)
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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Jamie1177: space

P.I.

Actually gained 1MPG.

Item Reviewed: P.I Performance Improver (API)
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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Gospelcoach: space

Awesome

This product is amazing. I have been using it for three years now, and the results are the exactly what is promised. I used a bottle every 3000 miles in all three of my cars.

Item Reviewed: P.I Performance Improver (API)
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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Bobcat1: space

Pi is the best!

I have a Land Rover and an Acura RDX. Both say use only premium gas. By using API every 5K or so I had absolutely no problems. Highly recommend it!

Item Reviewed: P.I Performance Improver (API)
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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Dwillz: space

Awesome

Noticed a change in my gas mileage right away!!!

Item Reviewed: P.I Performance Improver (API)
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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by steve: space

Great product

Every time I use this, my vehicles run better and mpg goes up as well. Recommend highly

Item Reviewed: P.I Performance Improver (API)
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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Dave507: space

I would buy this product again

Works great

Item Reviewed: P.I Performance Improver (API)
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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Goody: space

Excellent Product

I have been using Amsoil PI for over 30 years and never had problems with fuel injectors or valves. I even put some in my gasoline supply that I use to power mowers and snow blowers.

Item Reviewed: P.I Performance Improver (API)
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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Airwreck Nest: space

Deep clean

Smoothed out the idle and throttle response improved. I don't recommend using this all the time, but I think it is a must with every few oil changes.

Item Reviewed: P.I Performance Improver (API)
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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Ghost Runner: space

I would buy this again

I use a bottle every 5K. I'm on my third use. Each time I use it the idle of the engine gets smoother.

Item Reviewed: P.I Performance Improver (API)
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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Ricky racer: space

I would love to purschas this product again....

I use this in my camaro to help me out with the lack of performance and mpg.

Item Reviewed: P.I Performance Improver (API)
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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Jackknife: space

Awesome cleaner

I use this every oil change, works great

Item Reviewed: P.I Performance Improver (API)
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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Electric: space

Great power booster

l usually sad a bottle to tank gas every 5,000 miles to prevent any trouble with gas and engine

Item Reviewed: P.I Performance Improver (API)
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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Mysftail: space

I make it a part of my maintenance schedule

A few vehicles ago I noticed that my truck was running sluggish, so i purchased this product. The next oil change I added it and it did everything I had hoped for. Truck ran better, received better gas mileage, and saved me a trip to the dealer.
I recommend the P.i. improver, and use it on a regular basis.

Item Reviewed: P.I Performance Improver (API)
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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by J&J: space

additives

They are a must do to improve performance

Item Reviewed: P.I Performance Improver (API)
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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Timbo: space

Excellent prudent, will use this many more times

Seen immediate results when I put this in my truck. Improved the idle better than several other products that I have tried.

Item Reviewed: P.I Performance Improver (API)
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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by RawEffect: space

Not convinced it did anything

Put it in gas as per directions, drove it around in my 2012 work van, 140,000km. Normal average consumption is 11.8 to 12.4L/100km, and I fell in that range for the treatment tank, and the following tank. Can't say if it cleaned anything out, but I can say it didn't help mileage.

Item Reviewed: P.I Performance Improver (API)
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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Ric: space

I will purchase this product again

This product has done an excellent job of cleaning the gunk out of my fuel system and injectors.

Item Reviewed: P.I Performance Improver (API)
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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Chris: space

Best out there

Use it in all my vehicles, snowmobiles, motorcycles, and other gasoline powered stuff.

Item Reviewed: P.I Performance Improver (API)
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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by dchan: space

Good cleaner

I t help the car more power and clean a lot of unused item

Item Reviewed: P.I Performance Improver (API)
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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Mauro P: space

P.i. Performance Improver Gasoline Additiv

I've been using Amsoil for years great products especially this fuel additive see a difference in vehicle performance on first fill up

Item Reviewed: P.I Performance Improver (API)
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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Chad: space

Felt nothing like it

Put this in your fuel and a tank later you'll feel lower shift points, less shifting with inclines, better fuel milage. I attest to this great product. Never felt the difference with other top brands.

Item Reviewed: P.I Performance Improver (API)
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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Charles: space

I have ordered more for use on other units

I used on a 2008 Mercedes Benz c300 and got great results.

Item Reviewed: P.I Performance Improver (API)
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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Brian: space

Great product!

smoothed out my idle and the car has a bit more zip now!

Item Reviewed: P.I Performance Improver (API)
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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by David: space

I buy this all the time.

It actually works amsoil is a excellent product I use amsoil in every car I own. From this to there oils.

Item Reviewed: P.I Performance Improver (API)
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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by David: space

A Must A Each Oil Change.

This stuff is a must a every oil change.

Item Reviewed: P.I Performance Improver (API)
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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Gerald: space

Good stuff

I will be running this in all of my autos twice a year fall and spring.

Item Reviewed: P.I Performance Improver (API)
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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by GREG: space

Great product

This is the best fuel treatment hands down

Item Reviewed: P.I Performance Improver (API)
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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Denis: space

As important as oil change.

Each two months I invest to keep up clean the combustion chamber. It's a no brainer.

Item Reviewed: P.I Performance Improver (API)
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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by William: space

I won't use anything else.

For years I used chevron techron fuel system cleaner. This product is only a couple dollars more, and does a much better job.

Item Reviewed: P.I Performance Improver (API)
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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Stew: space

Best fuel system cleaner on the market hands down

My friends & I use this product every 5000 miles & we love it !

Item Reviewed: P.I Performance Improver (API)
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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Gene: space

I would buy this product again

I dont use it all the time but every time that I have my freeway MPG jumps from about 27 to about 30
1999 C5 Corvette.

Item Reviewed: P.I Performance Improver (API)
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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by ANDRE: space

i will use it til the end

every 4000 miles in the tank thank you

Item Reviewed: P.I Performance Improver (API)
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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Joshua: space

Burns and goes vroom

You put it in your gas tank and it leaves through you tailpipe ..... How can I review a gasoline additive? I "think" it's helping but I'm not sure.

Item Reviewed: P.I Performance Improver (API)
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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Mark: space

Good Product for Fuel Mileage and Cleaning the System...

I use this about once a year...usually during the colder months to improve mileage and performance. It seems to help with mileage, though not sure about performance, as it appears negligible. Overall, this is a useful product. My hope is that it cleans out some of that terrible ethanol garbage we get at the pumps these days.

Item Reviewed: P.I Performance Improver (API)
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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by TIM: space

I will continue to purchase P.I. at every oil change !

This is truly the best product of its kind available and delivers what it promises; I use a bottle at every oil change !!!

Item Reviewed: P.I Performance Improver (API)
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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Floyd: space

P.I. performance gas additive

Keeps engine running smoothly and good performance on gas mileage.

Item Reviewed: P.I Performance Improver (API)
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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by LANCE: space

Treat your vehicle

After a long winter in storage, I toss a bottle of this into my 99 VFR800 fuel to give it that spring clean, it has not failed me yet, the bike always flashes right up and runs like a dream for the season.

Item Reviewed: P.I Performance Improver (API)
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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by ANDREW: space

I would definitely buy this again

Added mpg, and engine runs smoother

Item Reviewed: P.I Performance Improver (API)
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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by ANDREW: space

I would buy this product again

Appears to add mpg, and engine runs better

Item Reviewed: P.I Performance Improver (API)
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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Alan: space

Great product!

I use one every 6 months. Keeps the injectors clean. Difference is noticeable.

Item Reviewed: P.I Performance Improver (API)
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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Shane: space

Good stuff

Great product when used as directed.

Item Reviewed: P.I Performance Improver (API)
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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Thomas: space

I love this product

I use PI every 5,000 miles to keep my direct injection fuel system clean.

Item Reviewed: P.I Performance Improver (API)
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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Joseph: space

2011 Colorado

Every time I use this on my 11 Colorado i5 my gas mileage goes up to 20 and it's runs smoother. I also get a couple extra miles to the tank

Item Reviewed: P.I Performance Improver (API)
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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Brian: space

I will continue to use this additive

I add this to my generator, mower, blowers,boat 9.9 hp, and vehicles. It makes a difference.

Item Reviewed: P.I Performance Improver (API)
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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Stan: space

P.I. Great, Amsoil Inc. Not Great

Amsoil products are great.

Amsoil as a company, poor. Always charging more than the total paid after the items ship, shipping cost through the roof, taxing shipping...

Free gifts now!! Yeah, never saw one of those...

Item Reviewed: P.I Performance Improver (API)
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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Karvoris: space

Great additive

I use twice a year with 93 octane gas no issues great results.

Item Reviewed: P.I Performance Improver (API)
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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Timothy: space

I put Amsoil in my wifes car and my son's Truck

I bought a new to me 2014 F-150 FX2 with all the bells and stuff. I have been using the Amsoil products for years,
and really like the performance that I get out of them. My hats off to the guys that make our cars and trucks
not only run better but last a heck of a lot longer. Very satisfied Pro shopper!!

Item Reviewed: P.I Performance Improver (API)
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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Joshua: space

Pi

This is the best stuff I've ever used

Item Reviewed: P.I Performance Improver (API)
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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Tim: space

I was hesitate at first but was glad I bought

Great product. Unbelievable.

Item Reviewed: P.I Performance Improver (API)
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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Cal: space

P.l.

I like this product!

Item Reviewed: P.I Performance Improver (API)
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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by EG: space

HIGH QUALITY FUEL SYSTEM AND COMBUSTION CHAMBER CLEANER

I recommend AMSOIL p.I. cleaner to anyone to clean the engine combustion chamber and fuel injectors or carburetor of a gasoline engine. I've used this exact product on a recommended vehicle maintenance schedule for many years. There is a very noticeable difference to prevent engine from knocking by cleaning the carbon from the combustion chamber. I use this in a Ford truck, Pontiac car and a Kawasaki motorcycle. Highly recommended above any product of its kind is AMSOIL p.I.

Item Reviewed: P.I Performance Improver (API)
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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by IronHeadChef: space

I do buy this product over and over again

Before I started using this product (P.I.) my 2006 Toyota Tacome was getting about 19 - 20 MPG. When I use this product it moves easily to 20-22 MPH. It must be doing something good. However, I must admit to using exclusively Amsoil Signature oil.

Item Reviewed: P.I Performance Improver (API)
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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Papa Smurf: space

Use every oil change

I use a bottle of this every time I change my oil. So far at 240,000km (145,000m) no injector problems.......

Item Reviewed: P.I Performance Improver (API)
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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by mikey: space

I Love this product

I use this every time i tow my camper.

Item Reviewed: P.I Performance Improver (API)
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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by JWFARMER: space

WHERES THE P.I.?

I put the product in my 2007 Chevrolet Tahoe with 140,000 miles. I did not notice a difference at all. I have used multiple Amsoil products but ill probably never use this one again.

Item Reviewed: P.I Performance Improver (API)
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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Jag Fan: space

I use this product ALL the time

I have a1970 and 1974 E Type Jaguars which were built to run on leaded 98 Octane fuel. Since researching various Octane boosting products and finding this Amsoil product I buy it by the case and use a bottle every time I fill up the tanks in my cars and they have never run better! Love this product. Improved the gas mileage as well which was an added bonus.

Item Reviewed: P.I Performance Improver (API)
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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Rerapper: space

Super Fuel Additive

This product is super for all gasoline engines!
I use in all my vehicles plus my outboard engine. They purr along with this product without any hiccups or pauses

Item Reviewed: P.I Performance Improver (API)
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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Brunelle Luc: space

Use of P.I. Improver

I used the Improver in my 2000 2.0L VW and also with my Yamaha outboard 100hp 4 stroke. They both have high mileage and religiously maintened. The P.I. did remove blue smoke happening occasionly at starting and gived both engine a extremely smooth idle and better throtle response.
Excellent product to use helping engines like new again!
Luc Damexco racing,

Item Reviewed: P.I Performance Improver (API)
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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Duke: space

Unlike anything else on the market

Use it in my boat , from season to season , never had a fuel problem after a winter storage ..

Item Reviewed: P.I Performance Improver (API)
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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by BR: space

Amsoil Performance Improver for Gasoline

I keep my vehicle serviced on schedule, and use Marvel Mystery Oil in the fuel, for lubrication of injectors. Even with this good maintenance, I notice my engine runs better after using Amsoil's P.I.
I use the P.I. twice a year. My vehicle has over 240,000 miles on it and runs almost like new. It also passes smog tests with low emissions. I believe a strong fuel system cleaner and combustion chamber cleaner is needed for all engines, periodically. Amsoil P.I. is top quality, and is not harmful to the engine, like some strong solvents may be. P.I. is made of special oils and detergents, which are engineered to be safe and effective. I completely trust Amsoil for this product.

Item Reviewed: P.I Performance Improver (API)
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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Bassman: space

I would buy this product .and recommend it to Everybody

Everybodyshould get this product because it is great with gas and gas mileage.

Thanks I amsoil

Item Reviewed: P.I Performance Improver (API)
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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Marc: space

I purchase Amsoil PI again and again.

I have been using Amsoil PI in my truck, Atv and my Harley. I have been putting it in my truck since it was brand new. I have 45,000 miles on it now and i have not seen any difference in fuel mileage and with throttle response. The PI is keeping the fuel system clean. I get the same outcome with my Atv and harley even when they sit for several months.

Item Reviewed: P.I Performance Improver (API)
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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by TCG: space

Works Great!

Excellent worth every cent.

Item Reviewed: P.I Performance Improver (API)
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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Josh: space

Wow a product that performs as advertised

I love that it's no bs marketing just a product that does as claimed. I ran many product through various older vehicles I've owned and amsoil is a superior product.

Item Reviewed: P.I Performance Improver (API)
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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by POINTLES11: space

I KEEP THIS ON HAND NOW

I NOTES MY GAS MIL DROP FAST WENT FROM 24 DOWN TO 18 IN A 1 MONTH TIME FRAME. I WAS TOLD ABOUT THE AMSOIL P.I. PERFORMANCE. SO I FOUND SOME, I GOT 2 BOTTLES AND USED THEM BOTH BECAUSE I HAVE A 22 GAL GAS TANK. IN ONE TANK OF GAS I NOTES MY MIL WET UP TO 26 MIL PER GAL, AND I USE IT EVERY 5000 MIL. I AM STILL AT 26 MIL PER GAL. I BEN USEING NOW ALL MOST 2 YEARS THIS IS THE BEST STUFF OUT THERE.

Item Reviewed: P.I Performance Improver (API)
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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Slik: space

P I Perfrormance Improver

I used this product in my wife's car and noticed that the mileage increased along with a smoother running engine. My daughter was having an issue with her car stalling once she got below a half a tank of gas. I believe that it was a dirty filter and pickup in the tank. After running a bottle through her car, it cured the problem and made her car run better than it had since she had bought it two years earlier. Great product!

Item Reviewed: P.I Performance Improver (API)
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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Bill: space

Good stuff.

I've used other injector/fuel system cleaners for years. I discovered Amsoil's gas additive a couple years back. I use it every 4,000 miles like the directions state, and it keeps my 1995 Ranger with 160,000 miles running like new.

Item Reviewed: P.I Performance Improver (API)
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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Outdoors man: space

Best use on older vechiles

Use this on my friends car and it inproved the gas mileage by 3 percent.

Item Reviewed: P.I Performance Improver (API)
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Reviewed by Nancy: space

Nissan Altima Owner

My car was idling rough, and when I took off from a light it didn't seem to have the power it once had. I went to the garage and he recommended a tuneup.
A friend sells AMSOIL and he said to try the Pi.Improver, so for the cost I figured I would give it a try before going in for the tuneup. One bottle in the tank when I filled up and in about 3 days I noticed it wasn't idling rough anymore. OMG, this stuff works, I now have my car running like new, Thanks!

Item Reviewed: P.I Performance Improver (API)
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