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)
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.
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
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
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.
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.
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.
Maximum Fuel Economy
AMSOIL P.i. maximizes fuel efficiency by dissolving and removingfuel system deposits and other contaminants for improvedpower and overall performance.
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.
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.
Product Name: P.I Performance Improver (API)
Current Rating: 4.91out of 5 stars
Votes & Reviews: 368 vote(s) and 230 user reviews.
Reviewed by Ryan the lion: 
I purchase PI, every oil change. I feel that my 2010 Tahoe dose benefit from this fluid as it's high in mileage and the environment here is harsh for any vehicles. I really don't see any fuel mileage increase, but it's the engine is running smoother in the cold mornings.
It's a nice treat for the "Tank".
Reviewed by Rich:
I used this in one of my older high mileage cars and it seemed to really do what it was intended. I will use this again and probably even in the newer ones.
Reviewed by Hank:
Been using for years. Keeps moisture out and clean injectors
Reviewed by rooroo:
Great product
Reviewed by Dan:
This product works very well and I like using it, however it is expensive which limits my ability to purchase more and use it more ofter.
Reviewed by Dan:
This product works very well and I like using it, however it is expensive which limits my ability to purchase more and use it more ofter.
Reviewed by JMC:
Seem work good additive pi performance gasoline additive with 93 fuel noticed much more effective clean more deep work as great
Reviewed by ironrail:
I use this product every time that I change the oil on my vehicles. I drive about 1000 miles per week so I change my oil frequently. It does what it says that it does. i wish it were already added to the gas at the pumps. My vehicles run as smooth as silk.
Reviewed by John R:
Used this product many times at every oil change all but good results.
Reviewed by Mark W:
I just completed my second try of P.I. I didn't notice any change during or after my first tank and waited for another oil change before trying it again. On the second use I did notice a change in mileage and the engine did seem to run smoother. I will continue to use as directed.
Reviewed by Mix:
Works as stated
Reviewed by Gas addative:
I use PI gas sedative in all 3 of my vehicles plus lawn mower and snow blower helps keep carbon down.
Reviewed by Jbush0202:
Once a month you will tell a difference in all aspects,of car ownership
Reviewed by Patch:
I am amazed at the difference in my pickup every time I use this. I use PI twice a year. once when I do my oil change, and again 6 months later. I notice a smoother idle, a small increase in MPG and a boost in power. It is not huge, but enough to know I have used the PI, and that it is working.
Reviewed by Patch:
I am amazed at the difference in my pickup every time I use this. I use PI twice a year. once when I do my oil change, and again 6 months later. I notice a smoother idle, a small increase in MPG and a boost in power. It is not huge, but enough to know I have used the PI, and that it is working.
Reviewed by 4Runner:
Best product ever thanks
Reviewed by AMSOILfan:
I use the PI in the fuel system on every 4 stroke engine I have. It noticeably keeps them running smooth and at peak fuel economy. This was evidenced after pulling the fuel rail off my truck, which had 15 years of daily use at that time, to change intake manifold seals. The fuel injector nozzles were completely clean!
Reviewed by Vinny m:
I have been using amsoil now for about 8 months in my cars and motorcycles and I love it works very very well and it is a high quality product
Reviewed by Hippie:
I use P.i. in my daily driver every few months. It makes my engine run smooth and it feels peppier! My only complaint is it's a little pricey. I'm hooked though, Customer for life!
Reviewed by Bear:
I have used the P.I.Performance in several cars and trucks of all ages. P.I. will help keep the fuel system clean and increase Horse Power and Mileage
I have recommended this product to friends and relatives and they have all agreed its a great product and will continue to use it..
Reviewed by Wildkatt1966:
I have using Amsoil since 1979 in all my vehicles. I had a 1981 Toyota 4X4 SR5 that I used Amsoil from day one. I had to rebuild the tranny at 30K & 60K miles (no fault of Amsoil-Toyota used a Celica tranny that was very underrated for the 4X4). When I removed the parts the syncos and gears looked like new. The main problem was the input bearing was to small and chewed itself up at 30K and 60K miles.
Never bought another Toyota since they would not honor their 30K warranty.
Reviewed by Rj:
Put this in all of my cars and they got better gas millage.i recommend this product to all of my friends
Reviewed by Sam:
Great product and gives your vehicle a clean out and a mileage boost.
Reviewed by Chief Worm:
I used this on a company car that only drove short distances around the work site (Orlando Airport). I used this product on my personal car and liked the results so I used it in this company car and WOW!!! The results were phenomenal. No more rough starts. No acceleration lag. It was like a totally new car.
Reviewed by Paul:
I use this product every other month and it keeps all my vehicles running great.
Reviewed by Just Rick:
I use this product to keep the fuel injectors in my Honda Fit clean. It seems to improve the fuel mileage and restores the power that is lost because of the poor quality fuel on the market today.
Reviewed by BUCK:
WORKS GOOD, ALL MY TRUCKS RUN FINE. PUSHING 248k MILES ON MY '98 CHEVY. TRY QUICKSHOT FOR YOUR SMALL ENGINES, PUT IT IN THE GAS CAN WHEN YOU FILL UP, REALLY CLEANS UP LAWN MOWERS AND CHAINS SAWS, THEY RUN SO NICE.
Reviewed by Tyson:
I put Amsoil in everything I own. I found that my vehicles and equipment last longer and perform better. My vehicles gfet better MPG, and handle all kinds of wear and tear.
Reviewed by Sparky:
Excellent
Reviewed by Bigred:
I like this product I use it fir cleaning the fuel systems and can tell a big difference.
Reviewed by Husbandly Car Repairer:
Wifey left her flagship Mercedes Benz unused for a long time and the engine was really rough. I poured in 2 oz per tank until the idle was smooth. I recommend putting a little in at a time in case injectors get plugged with a whole bottle. So start slow for the first tank and then increase. Lovely stuff.
Reviewed by SAABGUY:
Great Product,Probably The Best.Wish AMSOIL Cut One A Break On Shipping!
Reviewed by Tbone:
Have used this product for years have never had any fuel system problems.
Reviewed by Big red:
I like this product I use it fir cleaning the fuel systems and can tell a big difference.
Reviewed by Curt:
I use this in all of my vehicles, but I really know it works when I had a motorcycle that was used very little. The carbs were gummed up and it wasn't running right. I really didn't want to tear the carbs apart, so I ran a few tankfuls of gas with PI in it through and it cleaned up the carbs. The motorcycle now runs right!
Reviewed by Nuts and bolts:
Install this in your gas tank and your milage might just incress .
Reviewed by Big z:
I've used amsoil ever since I bought my car new. And the fuel injector cleaner joined with the oil has kept the car running great and like new.
Reviewed by Clint:
I usually use Lucas but now I'm forever switching to the performance improver. I have used this in my motorcycle and my car. When using this with regular gas with 10% ethanol in it I usually see an increase in my dodge dart from 31 mpg to 34 mpg. When using it with regular ethanol free gas i get 39 mpg. In my motorcycle i only use ethanol free premium gas and see an increase from 50 mpg to about 58 mpg.
Reviewed by Hikerman124:
The name says it all, "Performance Improver Gasoline Additive"! It does exactly as the name says, it has improved the power and responsiveness of all my vehicles and toys and improves mileage as well. I got the second best mileage that I ever gotten in my Tacoma truck after adding a full bottle to a tank of gas. And that's despite driving 10-15 km/hr. faster than I normally drive with a 40-50 km/hr. head wind over a 5 hr driving period. The only time I got better mileage was with a 60 km/hr. tail wind and driving 25 km/hr. slower.
Reviewed by Big D.:
I use this in my 2003 Ranger Ford & my 2003 Explore. It keeps my intake clean and gave me more horse power too.
Reviewed by Big D:
I use this in my 2003 Ranger Ford & my 2003 Explore. It keeps my intake clean and gave me more horse power too.
Reviewed by Trevor:
I think Amsoil make top of the line products. I use this product in my vehicles every 4 to 6 months.
Reviewed by Eyhab:
Fantastic
Reviewed by Chguck:
If used as directed it does a great job
Reviewed by BAC:
Use this on both my vehicles every 5,000 miles and it seems to help keep injectors clean, running smoothly with smooth idling.
Reviewed by Rich:
motors that don't get used much put PI in smooths right out.buy it
Reviewed by Lineman:
This added 2 plus mpg, I really don't care about that, I want smooth running and clean burning
Reviewed by Hector:
Good product thanks amsoil
Reviewed by Jonesy:
I put a bottle of this in my 2005 Chevy Avalanche every 5000 miles and between that and Amsoil Signature Series oil I use I have over 200,000 miles and it is still going strong!!
Reviewed by Iceman139:
I am not sure if the product actually does much to improve the fuel mileage of my 6 cylinder Chrysler 200 but it does seem to run smoothly . I just use it when I change my oil and filter to help keep the fuel injection system clean. I figure if I'm gonna put in clean oil.and filter, might as well clean fuel system too!
Reviewed by Iceman139:
I am not sure if the product actually does much to improve the fuel mileage of my 6 cylinder Chrysler 200 but it does seem to run smoothly . I just use it when I change my oil and filter to help keep the fuel injection system clean. I figure if I'm gonna put in clean oil.and filter, might as well clean fuel system too!
Reviewed by pete:
WORKS VERY WELL
Reviewed by San Diego:
Used in a Scion tC, cleaning agents inside work very effectively. Can feel power being restored to the car over the course of the tank of gas. I use 3/4ths a bottle every 5000 miles to make sure everything is clean and pristine.
Reviewed by Crimefighter:
My Honda Accord, EX-L had a hesitation problem for some time. I tried other additives that did not work. When I tried Amsoil Gasoline Additive it worked and is still working. Next treatment is at 4000 mile after first use.
Reviewed by Mario:
Love this product and I do use the P.i. performance improver gasoline additive every 3 thousand miles. Do recommend.
Reviewed by Gmcfanboy:
Had a slight hesitation after shifting into 2d gear for the last year. Added bottle to full tank of gas and by a 1/2 tank the hesitation was gone and has remained gone.
Reviewed by Kipster:
Am using this stuff every oil change. Will update as I go
Reviewed by Champion200:
I use P.i. every 5000 miles because it's easier to track that frequency on my odometer. I have over 130,000 miles on my 2007 Silverado and have experienced zero fuel injector problems.
Reviewed by Falcon:
Occasionally I pull a plug from my engines and use a bore scope and check the combustion chamber.
Valves and pistons are carbon free thanks to this excellent fuel additive.
Reviewed by Barry:
Add a bottle of P.I. to the tank of our 2011 GMC Terrain V6 every 5000 miles since new. Now have about 134,000 miles and it runs better than new. I am really amazed at how smooth it runs and the gas mileage is the same now as it was when new. I use P.I in my H-D motorcycle and for the all the motorized lawn and garden equipment. My 23 year old lawn tractor still runs like a top; Amsoil in the crankcase and P.I. in the tank.
Reviewed by Viper6:
I use it in my car, truck, motorcycle, lawnmower, chainsaw, trimmer, blower.
Reviewed by J. Ras:
I drive about 5000 miles per month. Once a month I use the PI and can hear, feel the difference.
Reviewed by Bruce:
Gas was slightly contaminated AMSoil straightened it all out.
Reviewed by Blake:
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.
Reviewed by Kevin:
I can tell a huge difference in my cars . Most other products I can not. I love Amsoil products!
Reviewed by Boostedwrx:
Great product love the performance and protection I getting from additive
Reviewed by Desrah:
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.
Reviewed by Desrah:
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.
Reviewed by Gaby:
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.
Reviewed by Tony:
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.
Reviewed by Tony:
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.
Reviewed by Jams:
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.
Reviewed by Jalms:
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.
Reviewed by Dave:
Used this priduct to clean fuel system on our Nissan Rogue. Instead of just 28mph, we now get 33mph.
Reviewed by mcf:
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.
Reviewed by mcf:
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.
Reviewed by Ron from Kentucky:
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.
Reviewed by Rollin:
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.
Reviewed by Dave:
I use this in my Ford car once or twice a year to clean the fuel system.
Reviewed by Singer of Songs:
I use this product religiously to keep my fuel system on my 2005 Ford F-150, in the best shape I can.
Reviewed by Randy:
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.
Reviewed by Alan:
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!
Reviewed by Tom:
Works great
Reviewed by longhaul:
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.
Reviewed by tootall:
Use in all my gas powered equipment
Reviewed by mechanic:
PI Performance works great added horse power and increase fuel millage.
Reviewed by Mac:
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.
Reviewed by HILTY:
IN CAR, TRUCK, MOWERS
Reviewed by Zman:
Improved my gas mileage & performance overall better running engine for sure😎👍🏼
Reviewed by Tim:
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.
Reviewed by Jake:
I use this product every six months. My 12.5 year old injectors were perfectly clean after inspection. I'd say it works great.
Reviewed by none:
It works.
Reviewed by Silver Hair:
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.
Reviewed by Mark the pipeliner:
I add to all of our vehicles every oil change to help keep the fuel system clean and at it's optimum.
Reviewed by CJ:
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!
Reviewed by Jake:
Makes a dramatic increase in fuel economy
Reviewed by mr jim:
PUT IT IN TWICE YEAR IN A FULL TANK.
AND NEVER HAD A PROBLEM STARTS GOOD
IN ANY WEATHER HOT & COLD WET OR DRY
Reviewed by Butch:
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.
Reviewed by Monk:
This always makes the car run more smooth and better feeling acceleration and general improvement overall
Reviewed by mobilemotormedic:
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.
Reviewed by Dan:
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.
Reviewed by Devolm:
I'm very happy with this product and will ordering more soon
Reviewed by Subie Speedy:
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.
Reviewed by Charlie TUNA:
Does what it says on the bottle!! Great product.
Reviewed by Mikey:
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.
Reviewed by SHUZAAM:
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.
Reviewed by AcuDoc:
Boosted MPG
Reviewed by AcuDoc:
Boosted MPG
Reviewed by don't have one:
The product work as advertise nothing special, didn't see any great performance.
Reviewed by none:
The product work as advertise nothing special, didn't see any great performance.
Reviewed by One Crank to Another:
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.
Reviewed by Ron906:
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.
Reviewed by ZH:
Great product, really makes a difference in restoring engine performance.
Reviewed by ZM:
Great product, really makes a difference in restoring engine performance.
Reviewed by wtrbxr:
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.
Reviewed by Chi:
Great product
Reviewed by LGC driver:
Pour it in, fill the tank and go. Does everything else. I treat my gas every 7000 miles. No issues ever
Reviewed by Dg:
Just keep using this product because it works
Reviewed by GRN:
I can see an increase in mileage.
Reviewed by mm:
keeps my truck running great, cleans my fuel injectors improves my gas milage.
Reviewed by cam50cam:
I recently added this to my 2016 Sequoia. Can notice a quicker throttle response and better running vehicle
Reviewed by Tu D Truong:
This product is very good keep my engine run smooth
Reviewed by Lipster:
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!
Reviewed by Hammer51:
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.
Reviewed by Mr. HoneyDo:
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.
Reviewed by None.:
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.
Reviewed by PaPa Mike:
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.
Reviewed by Matt:
Used Amsoil PI in a number of cars and every time I use I get better gas mileage and better throttle response.
Reviewed by Jerry Rumba:
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.
Reviewed by Brent:
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
Reviewed by D:
I use this product in all of my vehicle
Reviewed by Jay:
I used to use Sea foam, but this product is better and it is less expensive.
Reviewed by Suspension Jeff:
Pour in tank like it says! You'll get improved performance, vehicle runs smooth & great acceleration!
Reviewed by Ed G.:
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..
Reviewed by Ed:
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..
Reviewed by grandka:
seems to help quite a bit when I use it
Reviewed by MtnBiker:
Putting this in my tank every 4k keeps my 2007 F150 running in top form.
Reviewed by Rob:
I added it to the recommended amount of gas.
Reviewed by Rob:
I added it to the recommended amount of gas.
Reviewed by Lycanit:
No issue noted and no loss of mileage. I attribute that to regular use of PI. Strongly recommend
Reviewed by Racerscott3:
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.
Reviewed by Jamie1177:
Actually gained 1MPG.
Reviewed by Jamie1177:
Actually gained 1MPG.
Reviewed by Gospelcoach:
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.
Reviewed by Bobcat1:
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!
Reviewed by Dwillz:
Noticed a change in my gas mileage right away!!!
Reviewed by steve:
Every time I use this, my vehicles run better and mpg goes up as well. Recommend highly
Reviewed by Dave507:
Works great
Reviewed by Dave507:
Works great
Reviewed by Airwreck Nest:
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.
Reviewed by goody:
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.
Reviewed by Eriction:
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.
Reviewed by Ghost Runner:
I use a bottle every 5K. I'm on my third use. Each time I use it the idle of the engine gets smoother.
Reviewed by Ricky racer:
I use this in my camaro to help me out with the lack of performance and mpg.
Reviewed by Jackknife:
I use this every oil change, works great
Reviewed by Electric:
l usually sad a bottle to tank gas every 5,000 miles to prevent any trouble with gas and engine
Reviewed by Mysftail:
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.
Reviewed by J&J:
They are a must do to improve performance
Reviewed by J&J:
They are a must do to improve performance
Reviewed by Timbo:
Seen immediate results when I put this in my truck. Improved the idle better than several other products that I have tried.
Reviewed by BusaTim:
Seen immediate results when I put this in my truck. Improved the idle better than several other products that I have tried.
Reviewed by Ric:
This product has done an excellent job of cleaning the gunk out of my fuel system and injectors.
Reviewed by RawEffect:
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.
Reviewed by Ric:
This product has done an excellent job of cleaning the gunk out of my fuel system and injectors.
Reviewed by Chris:
Use it in all my vehicles, snowmobiles, motorcycles, and other gasoline powered stuff.
Reviewed by Mauro P:
I've been using Amsoil for years great products especially this fuel additive see a difference in vehicle performance on first fill up
Reviewed by dchan:
I t help the car more power and clean a lot of unused item
Reviewed by Moe:
I've been using Amsoil for years great products especially this fuel additive see a difference in vehicle performance on first fill up
Reviewed by Chad:
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.
Reviewed by Charles:
I used on a 2008 Mercedes Benz c300 and got great results.
Reviewed by Brian:
smoothed out my idle and the car has a bit more zip now!
Reviewed by David:
It actually works amsoil is a excellent product I use amsoil in every car I own. From this to there oils.
Reviewed by David:
This stuff is a must a every oil change.
Reviewed by Gerald:
I will be running this in all of my autos twice a year fall and spring.
Reviewed by GREG:
This is the best fuel treatment hands down
Reviewed by Denis:
Each two months I invest to keep up clean the combustion chamber. It's a no brainer.
Reviewed by William:
For years I used chevron techron fuel system cleaner. This product is only a couple dollars more, and does a much better job.
Reviewed by Stew:
My friends & I use this product every 5000 miles & we love it !
Reviewed by Gene:
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.
Reviewed by ANDRE:
every 4000 miles in the tank thank you
Reviewed by Joshua:
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.
Reviewed by Mark:
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.
Reviewed by TIM:
This is truly the best product of its kind available and delivers what it promises; I use a bottle at every oil change !!!
Reviewed by Floyd:
Keeps engine running smoothly and good performance on gas mileage.
Reviewed by LANCE:
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.
Reviewed by ANDREW:
Added mpg, and engine runs smoother
Reviewed by ANDREW:
Added mpg, and engine runs smoother
Reviewed by ANDREW:
Appears to add mpg, and engine runs better
Reviewed by Alan:
I use one every 6 months. Keeps the injectors clean. Difference is noticeable.
Reviewed by Shane:
Great product when used as directed.
Reviewed by Thomas:
I use PI every 5,000 miles to keep my direct injection fuel system clean.
Reviewed by Joseph:
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
Reviewed by Brian:
I add this to my generator, mower, blowers,boat 9.9 hp, and vehicles. It makes a difference.
Reviewed by Stan:
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...
Reviewed by Karvoris:
I use twice a year with 93 octane gas no issues great results.
Reviewed by Timothy:
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!!
Reviewed by Joshua:
This is the best stuff I've ever used
Reviewed by Tim:
Great product. Unbelievable.
Reviewed by Tim:
Great product. Unbelievable.
Reviewed by dp:
I use this product in my gas for my small engine equipment around the farm, it works very well in stablizing the gas and i thinks heips the equipment run better as well.
Reviewed by lotoofla:
Living in Washington State, I don't ride my 2014 BMW R1200RT-LC year round so I leave it in the garage hooked up to a Battery Tender, and the gas tank filled with Pure Gas AND 3 oz. of Amsoil's Gasoline Stabilizer. Every summer when I start up my bike there is little hesitation, and the engine settles down to a steady idle. Riding that first tank shows no problems or misses in any RPM range, though I don't get the full mileage of 300 miles, but with the very next tank of gas things are back to normal.
Reviewed by Mx:
Great stuff for dirtbike
Reviewed by Cal:
I like this product!
Reviewed by AlYaz:
I trust Amsoil products, after using them for so many years. Our gasoline gets delivered by barge and then trucked to us. It's always got visible crud in it and I have to put it through a filter first. As soon as I get my gasoline, I filter it and add Amsoil Gasoline Stabilizer. While others in the area have had numerous problems with 'bad gas,' my gasoline has never let me down. It gets used in my Stihl saws, Echo yard equipment, my Polaris Ranger, my portable Honda generator, my Ariens wood splitter, etc. Never a problem.
Reviewed by Subwaync:
I drive a BMW and the last thing I want is a problem with the Fuel System. SO add this fuel additive to a Tank every so often and troubles stay away
Reviewed by n/a:
excellent product
Reviewed by Cal:
I like this product!
Reviewed by EG:
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.
Reviewed by IronHeadChef:
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.
Reviewed by EG:
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.
Reviewed by IronHeadChef:
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.
Reviewed by Papa Smurf:
I use a bottle of this every time I change my oil. So far at 240,000km (145,000m) no injector problems.......
Reviewed by Papa Smurf:
I use a bottle of this every time I change my oil. So far at 240,000km (145,000m) no injector problems.......
Reviewed by mikey:
I use this every time i tow my camper.
Reviewed by JWFARMER:
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.
Reviewed by Jag Fan:
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.
Reviewed by Rerapper:
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
Reviewed by Brunelle Luc:
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,
Reviewed by Duke:
Use it in my boat , from season to season , never had a fuel problem after a winter storage ..
Reviewed by BR:
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.
Reviewed by Bassman:
Everybodyshould get this product because it is great with gas and gas mileage.
Thanks I amsoil
Reviewed by Marc:
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.
Reviewed by TCG:
Excellent worth every cent.
Reviewed by Josh:
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.
Reviewed by POINTLES11:
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.
Reviewed by Slik:
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!
Reviewed by Bill:
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.
Reviewed by Outdoors man:
Use this on my friends car and it inproved the gas mileage by 3 percent.
Reviewed by Nancy:
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!
Canada
United States
It's a treat
I purchase PI, every oil change. I feel that my 2010 Tahoe dose benefit from this fluid as it's high in mileage and the environment here is harsh for any vehicles. I really don't see any fuel mileage increase, but it's the engine is running smoother in the cold mornings.
It's a nice treat for the "Tank".