Product Reviewed: Signature Series Motor Oils
Current Rating: 4.95 out of 5 stars
Votes & Reviews: 529 vote(s) and 1218 user reviews.
Reviewed by Chuck: 
Using this product in my wife's grand caravan
It's always on the go So I love the long interval between changes and I know I can trust Amsoil products to get the max miles out of the vehicle
Reviewed by KentuckyKen:
I have a 2018 Honda Clarity Plug In Hybrid Electric Vehicle' (PHEV). Most of my driving is local (< 50 miles) and uses the battery only so the gasoline engine can go months at a time without starting. I depend on the superior additives in Amsoil Signature Oil to hold up to the demands that only occasional engine runs with long periods between running places on the oil. With my driving schedule, Honda allows me to go 1 year between oil changes and I wouldn't trust that interval to anything but Amsoil.
Reviewed by Terryg:
This oil is absolutely the best product, I've been using Amsoil for more than 30 years and this is without a doubt there best product ever for most cars and trucks
Reviewed by Collector:
Best oil on tue market. I run it in all of my vehicles and I don't trade much so they have to last. From motorcycles to cars. Big trucks to small suvs, I trust only AMSOIL.
Reviewed by CDC:
Use to keep from changing oil so often
Reviewed by Muxdragon:
I drive a 2011 Tacoma. I change my oil yearly. I've only used this oil for all the oil changes. After a year, the oil on the dipstick is still gold after 15,000 miles. I do notice that at the year mark it need to be changed. The reason is because when I pour in the new oil the motor runs smoother. Great oil! It does what it says it does.
Reviewed by jeffro:
Have a 2006 Rav4 with V6 engine. Been using Amsoil's best oil (Signature 5W-30)and EA filters since the car was almost new. Vehicle now has 233,000 miles on it and does not smoke, burn oil or have any leaks. Still runs as new. Do my own oil/filter changes and do so at approximately every 15,000 miles and/or at least twice a year. The ambient temperatures can easily rise above 90 degrees and the AC is used daily. Do a lot of rural/highway driving and for half the life so far, stop and go city driving.
My other car is a 2000 Miata with almost 200,000 miles. Same scenario as above but I don't put as many miles on the car per year. I change the oil (Amsoil Signature 10W-30)and EA filter yearly. Changing the oil on this car is a pain because of how one must contort to get to the filter while laying on my back under the car. So
changing it once a year is a big plus. This engine does leak a bit out of the rear seal before the manual transmission. Can make 2500 mile cross-country trips at highway speed and use maybe a little under 1/2 quart (from the full mark on the dipstick).
As an old school "shade-tree" mechanic I highly recommend these oils and the EA(Amsoil) filters. The web-site is very helpful too, as are the staff with any verifying questions. I believe I save money both in the short and long run.
Reviewed by DC:
switched to amsoil years ago on a truck with 250000 mi.
lifter noise went away still runs today
Reviewed by Rubicon owner:
I have been using Signature Series oil in my trucks for years. When it is a new vehicle I switch at its first scheduled oil change. On a used vehicle, soon after purchase. I had a 2001 Silverado 5.3L purchased used with 22000 miles. Switched to Signature Series and drove it to approx. 98000 miles. Gave it to my son who went to around 150,000. Sold it they put about another 10000 on it and sold it again. Last I knew it was rusty but still running strong. As far as I know It has had no major engine work.
Reviewed by Rich:
Most complete motor oil ever,will never put anything else in my 2017 Chevy Silverado.
Reviewed by Huck:
I use the Signature 5W-30 motor oil in my 2014 Hyundai Elantra Sport. I was surprised the first time I changed the Amsoil Signature motor oil as to how dark the oil was when I drained it. Then it hit me that the synthetic oil was cleaning the engine from where previously the engine had only seen a multi-weight oil. One other thing I noticed is the engine temp. shows the motor is running cooler than it did before I started using AMSOIL.
Reviewed by Chardog:
My family has 4 vehicles and they all have Amsoil in them. I highly recommend using Amsoil.
Reviewed by Martin:
I have been running this oil in all my vehicles for several years, and have been very satisfied with the performance of the oil.
Reviewed by Malcolm:
Loving this oil
Reviewed by don:
i use amsoil in my truck, engine,rear end, trans, and my motocycles engine, trans clutch and i totally rely on it. my truck had a howl in the rear end when i would back off on speed after changing the rear end oil to amsoul it stoplped i love amsoil and highly recommend it to all my friends.
Reviewed by Joe and a Subaru:
So fare so good, I put amsoil in my 2016 Subaru impreza and she runs like a champ just like my 06 Chevy Silverado.
I have been running amsoil in my 06 Chevy Silverado for a few years now and I have seen the benefits both in overall preformance and reliablilty, it has transformed from a ticking tapping noisy engine to a quiet and smooth running one, you can't even tell it's running most days, the truck only has 100,806 miles on it but I wouldn't put any other oil in it, as soon as I try it start the lifter tapping thing again it is kind of weird in my opinion so I think its safe to say that this truck likes its amsoil.
But i thought to my self why not put it in mysubie and get the same benefits as the truck. Both vehicles have amsoil in ever oil driven/gear driven component and I am a believe in amsoil. I am think about trying it I'm my lawn mower this summer and in my snow blower this coming winter. Why not lol
Reviewed by Big Dawg Corvette:
Run this oil in my 2002 corvette road race car. Dry sump engine, need the best protection. Great oil and has not let me down! Thanks Amsoil!
Reviewed by Austin:
This oil exceededs my expectations by far. Before using this oil I would always have a faint ticking noise in my valve train. After using this oil it is so quiet i couldnt belive it. The oil life itslefs last an incredibly amount of time as well. One of my favorite things about amsoil ut leaves behind a small film of oil after u shut down your engine. So when u start back up it still has a small flim to protect your engine intell the oil is pumped up. I use amsoil in ever one of my vehicles
Reviewed by Ken_FJCruiser:
I trust this oil and the other Amsoil products because they work. I know that the maximum vehicle life and best operating effectiveness come from due diligence in maintaining it properly. There is great comfort in knowing I didn't compromise with the products I used. Keep rolling!
Reviewed by IndyCarDriver:
Have been using this product for about 9 years on both new and used vehicles. With extended mileage, I only change 1X per year. Cars have performed flawlessly.
Reviewed by jazool:
Our Subaru hemorrhaged out all of it's oil on a trip (16 miles) to our Mechanic. He later called us and asked what type of oil we used. When I told him Amsoil Signature Series, he said "keep using it; you were totally out of oil !!". Using it for 20 years now. Never had an oil related failure.
Reviewed by Larry:
I use Amsoil in all of my vehicles (4) and I believe that's why they perform and last a long time!!!
Reviewed by Phil:
I have used this product in my 2009 Civic since it was new. Now with 195000 miles It has never been in the shop except for tires and brakes and 100000 mile spark plug change. It still runs like it did when it was new.
Reviewed by Ramblin Roy:
The SS 0W-20 works awesome! I just wish it were a little cheaper in price, even with the PC, it is still a little bit high in my opinion. However, it is a great 100% synthetic oil. My 2015 Silverado with the 5.3 V8 runs a lot smoother and has more power with this SS oil in my opinion.
Reviewed by Fender Bender:
I've been an Amsoil PC for around 10 years now. I love Amsoil products and so do all my machines! There is no better value for your money. I have never had any engine problems in anything I have poured this liquid gold into. My wife's 2013 Toyota Rav4 loves it!
Reviewed by BW:
I use Amsoil in all of my vehicles as recommended. We just handed down a 2003 Toyota Matrix with over 200,000 miles on it to our Granddaughter. This car was still of high quality even though it was used daily on dusty and dirty farm roads; as well as highway. I hope she gets another 100,000 miles or more.
Reviewed by Gene:
Have used this oil on two of my trucks one has over250000 miles and still going strong. Love this oil,use it in my motorcycle too.
Reviewed by Gene:
I use it in my car and when I change oil it still has a great consistency
Reviewed by Floyd:
This oil I use in our 16 Escape, to better protect it's turbo. Living in Wisconsin it can be well below zero in the winter, and what a difference Amsoil synthetic oil makes.
Reviewed by Herby-Dean:
Nothing but good to say about amsoil products.... they are the best!
Reviewed by Bigred911s1:
I'm finding this oil looks cleaner and it's viscosity appears to hold up longer than Mobil 1 after the same 10k miles. I will continue to use this oil in my 2016 Mustang GT. 52k miles already and still running strong.
Reviewed by josh:
I run this oil in my 79 Chevy k10 and change it once a year with a fresh oil filter mid year my speedometer doesn't work so I don't have to worry about changing the oil every 3 months I am really pleased with this product
Reviewed by Ray:
I have been using these products for more almost 30 years. I trust them.
Reviewed by sparky:
I have been using Amsoil for at least ten (10) years, it's a life, and engine saver!
Reviewed by Rob C:
I've used the Signature Series oil in everything from a well-modified 99 Neon that routinely saw 8k rpm to my wife's turbocharged Ford Transit that takes our kids everywhere, and it's never let us down. I would conservatively put the amount of mileage we have on this oil over the last 20 years at 350k miles, and that's a lot of saved money in oil changes by using Amsoil's extended change intervals. I've never had a problem with any engine having oil loss issues, either, no matter how hard I ran the motor.
Reviewed by Todd:
Works great in my wife's Buick Verano. I also use the 5-30 and 10-30 signature series in our GM pickups. My 2003 Silverado has 293,400 miles and doesn't burn a drop of oil! Bought it with 90k on it and has had all Amsoil fluids in it ever since.
Reviewed by Bradley:
This oil works great with E85... Best I have found from the major brands.
Reviewed by Tom:
I used to be very sceptical of synthetic oil so I decided to try it in my company truck(not my company). The truck ran up 200,000 miles and still running strong with minimal oil consumpsion. My wife has a growing cleaning business and I do the maintenance on the cars. Using Amsoil I went from 5,000 mile changes to 15,000 miles using the Signature Series 5W-30.
She now has fifteen cars in her fleet, that
cuts my oil changes from forty five to fifteen, that is a tremendous labor savings for me and it actually saves money. I use Amsoil in all my vehicles now and it keeps them running strong. I recommend to anyone that asks that they need to try it out. Great Product
Reviewed by Jim:
When I buy any vehicle, I change to Amsoil Signature Series the first oil change and use nothing else thereafter. As a volunteer fireman, my vehicles are subject to being run at high speed while cold. Signature Series provides outstanding protection. Some have over 200,000 miles on them and none use oil.
Reviewed by Tim:
Modern GDI engines require excellent oil to stay clean and handle everyday extremes. If you are using your cars maintenance indicator you might be exceeding other oils capabilities I know signature series gives me the best I can get
Reviewed by Goose:
I run this Signature Series 5w-30 in nearly all my vehicles. Typically I see a 10% increase in gas mileage ( over an engine ran on conventional mineral oils ) on the interstate no matter what size engine. In one recent event, I blew a head gasket on a Quad 4 engine yet drove the car for about 10 miles. Observing the chocolate milk colored oil, the engine was not damaged as it was protected by Amsoil Signature Series lubricant.
Reviewed by JR:
Yes Amsoil oils are more costly that many
other oils. I keep my vehicles for decades
and want the best oil protection I can get.
Reviewed by Ian:
I use amsoil don all my vehicles
Reviewed by Robert:
I have used only Amsoil in my 2005 Toyota pickup.
I now have 205000 miles. I have never had a problem
and still us no oil and have no oil leaks.
Change every 25000 miles.
Reviewed by Dink:
Hi. I am totally sold on Amsoil ! Superb protection. Awesome lubrication. Even in a little engine overheating, it still protects ! I reccomend it to the world ! Nothing beats it ! Nothing !
Reviewed by Pat:
I can't think of anything negative to say
Reviewed by Chieftom:
In my personal auto's
Reviewed by Pistol:
Made the engine run so quiet
Reviewed by Dayjoe:
I don't remember how I got started with amsoil oil. I use it in all my motors. The 5w 30 is the one I use in my 2003 Chevy pickup. It was making a loud ticking noise before I started using amsoil in it. As soon as I started using it I could tell a noticeable difference and smoothness and the ticking went away so I'm very happy.
Reviewed by Kevin:
Best oil on the market.
Reviewed by Virped:
It goes in my 3.6VVT and my 5.4 2V and does wonders for engine noise, oil change intervals, and most of all performance! It doesn't matter if it's a modern engine or not so modern engine, it Works!
Reviewed by Trouty:
You can put any oil in a new engine and call it good. I run my cars 200k+ that's when oil matters. Amsoil cools,cleans, seals and lubricates better than anything I have used and I have tried them all.
Reviewed by Brandon:
I drive for work 1,000 miles plus a week, I use Amsoil in my car along with my wife's... I have right at 300,000 on a 2012 Kia Soul and the motor is just as good and clean as the day I purchased. I save money as well... using any other other brand is crazy
Reviewed by Guardian:
It's the best hands down! Some people think it's all the same ! There wrong! 25,000 miles you can not bet it.
Reviewed by Larry:
I have used AmsOil exclusively for over 20 years. It's the best there is. My truck loves it.
Reviewed by Jerry:
I use in my 1999 Corvette because I like to use the best, and also in my 2016 Dodge pickup.
Reviewed by Paul:
I use this every 5k miles. The car runs smoother and quiter than my previous oil changes. It doesn't lose it's slickness. I'm overall satisfied with this oil.
Reviewed by cheyfinn:
cars' trucks' & motorcycle, lawn mower, snow blower
Reviewed by Brad:
This is the best oil I have ever used in my Ram 1500.
Reviewed by Chris:
First thing I noticed right away was how it make an already smooth engine even smoother and quieter. I've always used Mobil 1 advanced 15k oil and have heard nothing but great things about Amsoil. A co worker of mine had a teacher in tech school who used to rebuild his engine every year after racing season. He switched to Amsoil and hasn't had to rebuild it in 5 years. As soon as I heard that I was sold. If you want the best Amsoil is it.
Reviewed by Road runner:
I have been using this product since vehicle was new and have had no issues with my vehicle. Engine runs great and strong and I change about every 15K vice 25K as put a lot of miles on this vehicle.
Reviewed by B:
I love this brand of oil and been using it for the past yr on mustang.
Reviewed by The Capt:
I have used this oil on my cars, trucks, and sedans. Never balk at the cost, knowing darn well I'm getting what I pay for. Less oil changes, frees up time, less waste, and superior protection.
Reviewed by Sam:
Last truck had 175K and never used a drop of oil. Change oil, run 15-20K and still full.
Reviewed by Watercooled:
After breaking in our two new 2017 Mustang GTs, performed oil/filter changes on both. The two things I noticed was quieter engine operations and a small increase in oil pressure. The engines also ran smoother than before. Overall, I'm very satisfied with the notable differences I've experienced.
Reviewed by Mark:
Best Around enough said
Reviewed by Cole:
I have been using this oil in my 02 siverado and 02 suburban since 04. 297k on the truck and 317k on the sub. Oil is changed once per year, have had 32k in one year on the truck. Engines still run great and have no oil consumption, increased fuel mileage seen on both. I don't use anything else
Reviewed by dodgehunter:
I used this on my 2002 Tahoe the oil at 3000 miles looks like new yet. In the very cold weather here in ND it start right up. Vary pleased with oil. I will be doing all the fluids in my Tahoe with Amsoil.
Reviewed by D.K.:
Unless I can't afford it Amsoil will be the only oil I use. It is very good and while some people say it is more expensive, they are usually comparing it to cheap oil, it is worth every penny.
Considering the extended service length it is great.
Reviewed by Dudewayne:
Been using this oil for several years now and get great results from it
Reviewed by Snarkman:
Been using Amsoil for decades, in everything I drive. Have over 2 million miles in a Semi with Amsoil. Increased life of every component . I pushed it to the limit , never failed. And I push hard ....
Reviewed by Carlitos:
I like taking care of my cars that's why I use Amsiol
Reviewed by JW:
I've been using Amsoil since 1998. I've had to replace the intake manifold gasket on past pickups, when the mechanic ask me if I cleaned the inside of the engine before bringing it in I said no, I use Amsoil full synthetic. He said well the inside of the engine had absolutely no carbon buildup. He said that was the cleanest engine he had ever seen that had 110,000 miles on it. From that day forward he too was a Amsoil customer.
Reviewed by D Grim:
I drive a 2009 HHR with a 2.0 NA 4 cylinder engine approx. 100 miles a day and have 160,000 plus for mileage. Economy comes in many forms in this case fuel, oil and tires are my biggest expenses and ones that I can somewhat control. We had a cold spell not to long ago of real temps -25 and colder. The HHR still has the original battery and with the Signature Series 5w/30 it cranked right up with out a problem. Next step is to submit an oil sample same time as the factory algorithm says to change oil.
Reviewed by steve:
The wear scar test results verify my faith in your products. combined with the best chemical package to keep my three Diesels & 2 Gasoline motors clean. I like the 25,000 mile products, saves time. thanks for the extra engineering it took for development of these products.
Reviewed by Rayford:
Actually get better fuel mileage , performance and reliability from using Amsoil . Why not use the best in these expensive vehicular .
Reviewed by Upon2wheelsBill:
Your products are easier to compare because the specific facts are up front and easy to understand and are a great value.
Reviewed by Daltonjc:
I use Amsoil in all my vehicles and equipment. I would recommend it to anyone.
Reviewed by RabbitJackson:
The truck runs great and uses no oil at 130,000 miles
Reviewed by Macs:
This oil does what they claim it can do. I normally try to change my oil at around 12000 miles, but sometimes if I'm too busy it goes much longer. At the last oil change, I changed it at 25000 miles. No problems whatsoever. The dipstick oil level was still normal after a year of use. The Signature series oils are worth the extra money. I also use the diesel oil in my 06 Duramax truck. It's about to hit 400,000 miles and not a single problem.
Reviewed by Tyrone:
Now this may sound negative but it's a positive. I bought the 10W 30 for my 1998 Jeep TJ 2.5 with 250,000 miles on it. Amzoil really cleaned and lubricated my engine really well. I dont recommend going to a synthetic motor oil if you have high milage and you did not you synthetic oil prior to because this oil cleaned my engine up but I developed a leak. But in retrospect I'm am going to use only Amzoil in it when I rebuild the engine. Went back to Dyno oil for the time being.
Reviewed by dave:
have used Amsoil for the last 15 yrs. never any complaint with it the only way I get my lawn tractor with the snowblower started in the winter starts every time
Reviewed by Bobby:
Using this oil in 1950 Chevy truck with 2004 LR4 4.8L engine. Starts and protects from below freezing to 90+ in summer with constant oil pressure. Engine looks new inside.
Reviewed by Tom:
I have changed both vehicles over to Amsoil in the engines and the differentials,transfer case and transmission on My pickup and will soon put in Amsoil coolant.
Reviewed by Lar:
As far as I am concerned Amsoil is simply the best for all of their products
Reviewed by Tom:
I have used Amsoil 0w 30 in my 1998 Corvette and now I have 213000 miles on it and there are no unusual engine noises. I change my oil once a year. I have three boats 2 Corvettes,1SUV and a motorcycle all use Amsoil products. I virtually have had no powertrain problems. I use nothing but Amsoil and will continue to do so. I appreciate Amsoil technical papers as they show the science behind these outstanding fluids and are useful to convince others of the merits of Amsoil.
Reviewed by Zed:
Excellent product and protection. After doing much research will only buy this product to protect my classic sports car, and daily driver.
Reviewed by Tom:
Long life. Engine oil stays clean.
Reviewed by The Doc:
I have been using Amsoil in my vehicles since 1986. After having to change a timing chain in an earlier vehicle...it was clear ( internally ) how good Amsoil actually is. The chaincase was as clean as if it was
just made. That vehicle continued on to + 260,000km with no oil leaks or other loss.
Amsoil....I am a fan for life!
Reviewed by flight:
I love all AMSOIL products
Reviewed by Rusty:
I use Amsoil in all my vehicles, and I have many. From my Shelby GT 500 to my ATV and lawn mower. Best oil you can buy!
Reviewed by Reno P:
Been using Amsoil Signature Series 5w20 for over 18 years and have been extremely happy with it. I go 15000 miles between changes and never use more than a half quart between changes. It's the BEST.
Reviewed by don't use one:
I use this in both of my vehicles; one specs 5W-20, the other 0W-20. It gets down to -15 degrees where I live in upstate NY and I depend on Amsoil to provide effective lubrication at temperatures where other oils struggle to perform. I generally put over 250,000 miles on each vehicle, and have never had one consume any Amsoil. Totally satisfied.
Reviewed by axecut:
I have to use the best oil. The cost of not using Amsoil will put me out of business
Reviewed by jb:
I've used this oil in my vehicles for at least 10 years and they have performed as promised.....also haven't had any leaks from the engine ....wouldn't change!
Reviewed by Trump2020:
This is by far, the best product on the market.
Reviewed by rblilly:
I do 10k mile oil changes per Toyota, but this oil comes out still clean, not even black. I have no doubt I could use it up to 25k miles.
Reviewed by Chris:
Every oil change gets Amsoil
Reviewed by Jake:
My 16.5 year old truck still started in the cold Iowa winter when plenty of other vehicles even newer ones wouldn't. Have to give credit to good synthetic oil.
Canada
United States
442k miles and still going!
I have 442,000 miles on my Nissan truck, (original engine) using amsoil 10w30; I change the filter every 6,000 miles, and the oil around 12,000, (usually). In fact, I just had to replace the original (!) valve cover gaskets last fall, after 14 years! Amsoil does the job