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 K: 
Oil is the best
Reviewed by BillyO:
Have used Amsoil on my 2018 WB Hellcat since 1st. oil change with Extremely satisfying results. So happy use it in my Jeep Wrangler as well. Nothing but the best for my vehicles.
Reviewed by Hey you:
This was recommended for my vehicle and I have used other amsoil products in other vehicles and have blessed using it. Tks
Reviewed by Jube:
I have been running an amsoil product in my 08 Toyota Tundra since new. When i say new i mean when the engine had enough km's that it was past the break in point I switched. I ran Amsoil XL for several years at the recommendation of the place i get my oil changes at. Changed it out every 6 months. I am pretty sure Signature Series was never recommend as they would only get my business once per year. Not knowing exactly what Amsoil had to offer I did some further research and discovered this Signature Series oil. I now change my own oil as I am able to order directly from Amsoil. I have been running Signature Series for about 5 yrs now with basically a once a yr oil change. I mainly drive secondary rds but come fall hunting seasons i am all over the backwoods. Here where i live it can get down to -30 at times during the winter. The flow rate is excellent in extreme cold as well as I always watch oil pressure gauge and no matter how cold it seems the needle always jumps up quickly on cold start up. My truck now has 271,000 KM's on it. Even with once a yr oil changes the oil doesn't look alot darker than it did when i changed it the previous year. Great product I can't imagine running a different oil in. I now have my son's truck running on Signature Series as well. I plan on putting 1 million Km's on my truck!
Reviewed by Frank:
2017 Tacoma TRD Off Road struggles to get 18mpg. Used Signature Series Synthetic and now getting 20-21mpg.
Reviewed by Frenchbernie:
Discover Amsoil in 2012 & have slowly been converting all my vehicles to Amsoil. Even converting friend but they are harder to convince because most rent their cars & basically don't care if they last or not. Consumer society. That being said all my immediate family use Amsoil.
Reviewed by Upschuck:
Save time, money and engine wear. Have used Amsoil in all my vehicles and equipment for over 25 years and and have not experienced an engine failure.
Reviewed by Clint H:
Been using Amsoil in my Dodge Dakota since I purchased it 13 years ago. Today it has 250,000 miles on it and still runs great.
Reviewed by Hard Rock Rubicon:
I have done only a couple of oil changes on my low mileage Jeep but I wanted the best oil and have no regrets with buying AmsOil signature series oil.
Reviewed by Oil buyers:
I'm not sure how you review oil.
When I opened container, the oil, was oily. So I put it in my engine.
My engine has not blown up, so I assume it's the right oil.
I'll keep buying their oil, until it no longer feels oily to the touch straight out of the bottle.
Reviewed by Glen:
I have a 96 Chev C-1500 with over 360k that has had AMSOIL in it for over 350k without any failures. It runs good and sounds like it has a new engine in it, but its the original without any major work on it. I also use AMSOIL in the transmission and the rear gears. I have had a valve cover off and you wouldn't believe how clean it was on the inside, no sludge.
Reviewed by Bill:
Feels and runs smoothly !
Reviewed by Ken L:
Excellent protection
Reviewed by Bubba:
I highly recommend this product. I only use amsoil products in everything from my compressor to my vehicles. They have done there homework to produce great products.
Reviewed by Vic:
AMSOULS NEED RETAIL OUTLETS
TO ADVERTISING.
Reviewed by JerseyGray:
I use Amsoil in everything from my truck to my motorcycle, lawn mowers, generators and anything that takes oil. I also use the oil filters, gear oil, and everything that Amsoil makes.
Reviewed by Rdskelton:
Oil pressure is improved with this product
Reviewed by Nick:
While I can't say the car runs better with this vs another top synthetic, I have hundreds of thousands of miles on my vehicles with this oil only changing once a year. Great stuff!
Reviewed by Nick:
Trusted product! This particular oil was made for my engine what can you ask more? They took the time and knowledge to make the oil possible for my car... its really a no brainer! Nice to have a compagnie that's back you up!
Reviewed by Randy:
I have been using AMS Oil for 18 years and wouldn't use anything else. It is by far the best and all of my vehicles with several hundred thousand miles on them combined is the proof.
Reviewed by Curt:
I doubled my miles between oil changes which saved me money, I use it in my small truck also.
Reviewed by Jeep Lover Josh:
So I run Amsoil signature series in all my vehicles. I run 5w-20 in the 2015 Jeep Rubicon Hard Rock and when I changed the oil at 7000 miles of use the oil lab came back and said to change at 9000 next time and see how it's doing. The wife's 2011 Subaru Impresa 5w-30 oil was changed at around 7000 miles as well and the results were the same! I think once the oil is tested at 9000 they will most likely advise I go even longer. They measured for contaminants as well as assessing the TBN which both came back outstanding, and both engines have zero issues. Black Labs is where I send my oil. The higher price for Amsoil is worth it in my opinion especially when I can go so long in between changes. It pays for itself.
Reviewed by oneshot:
I have numerous vehicles with 60-400,000 miles on them that have been running Amsoil most of their lives. All still have original engines. What more can I say?
Reviewed by Jordan:
So far so good. Only have 26k on the car so far.
Reviewed by Gator Shelby:
The best price and solid transactions
Reviewed by Oil Fan:
Used to go to quick non-synthetic oil change place until they stripped my oil pan threads. Decided to change my own and use Amsoil. Was changing every 5000 miles before now going 10,000 miles. Materials cost is more, about what materials and labor was before but I'm going twice as far.
Reviewed by Great OIL!:
Have been using this oil since around 2006. My 2006 Ford E350 work van has145,000 at 15,000 mile change intervals before I sold it . My 2006 E350 15 passenger van currently has 185,000 at 20,000 mile change intervals. Great oil have had no issues with it.
Reviewed by Wilson:
Engine has been running smoothly after changing into this signature oils.
Reviewed by LDW:
Best you can buy for your vehicle.
Reviewed by Brogan:
I was nervous switching from high mileage to a full synthetic, but 84 Chevy pickup now runs better than ever and actually has less leaks now. I also run this same oil in my 84 Honda Nighthawk motorcycle.
Reviewed by Ron:
All I use in my vehicle's is Amsoil ...I wanted to put good oil in my vehicle's so tryed Amsoil and been using it for 20 years now. It's the best hands down period...
Reviewed by The Mechanic:
I have used this product for years, I wouldn't trust any other product in my vechicles.
Reviewed by G'd up from the feet up:
Solid oil that's maintained it color and viscosity for 3k+ miles of spirited day to day driving
Reviewed by Sam:
This oil controls carbon buildup on the intake valves of gas direct injection engine. lowest evaporation rate.
Reviewed by Mark:
I have been using this product on my 2010 Mazda 3GT since new. I am nearing 186,000 miles on the car and have the oil checked at every change. The analyzers are always telling me the oil has more life left and everything looks great. I will be using this product in every vehicle I own and recommend it to everyone who asks. A first rate product!
Reviewed by SharpSmith:
As a mobile sharpener, I put a lot of miles on my vehicle. By using AMSOIL, I have peace of mind that my van will run smoothly for a very long time. I highly recommend this product!
Reviewed by JK:
I use product in my 2016 2.4 litre canyon . It's a great product but my engines seems consume some of it . A litre on 5000 km disappears through exhaust .
Reviewed by Felix:
Long lasting great protection
Reviewed by Joelon:
Going on 7k mile oil change...oil still looks new... Car performing well. Amsoil is the best of the best.. you get what you pay for...no more mobile one or Royal purple for me ..never again.
Reviewed by Rob:
I wouldn't use ANYTHING ELSE!!!!!
Reviewed by Pedro:
I be using amsolil in all my car back front the 1990 I never have any engine problem. All my cars run good and I put a lot of miles and the engine always run good ! I have 2014 Acura MDX I be using amsoil when the car make 7,500 and the car still running like new !
Reviewed by Pedro:
I be using amsolil in all my car back front the 1990 I never have any engine problem. All my cars run good and I put a lot of miles and the engine always run good ! I have now a 2018 Accord that only have 9 months and have already 31,000k and I be using amsoil when the car make 7,500 and the car still running like new !
Reviewed by JetAMT:
This is hands down the very best oil you can buy. Been a faithful Amsoil user sense 1982. The very best protection there is
Reviewed by JT:
When servicing my vehicles with Amsoil Sinature series oil, the dealer always comments on how there are no leaks. It also increases my trade in value when I upgrade. Never a complaint.
Reviewed by Mal:
Using this Motor Oil puts me at ease and you can depend on it to so it's job. I have used Ams Oil for years now and it keeps your engine running as quiet with nearly 200,000 miles on it as the 1st day you got your car. It definitly keeps your internals sludge free. This I have experienced first hand. Oil pan and valve cover removal.
Reviewed by Tarzan:
I use Amsoil products for all of my lubricants in all my vehicles and equipment since 2015. I am very pleased with the performance and protection and am convinced these products are second to none. I bought an F-150 in 2015 that sounded like the transmission was ruined, put in an other brand of transmission fluid and nothing changed. I then put in Amsoil transmission fluid and it immediately fixed the problem. I haven't looked back since. I know the products might be a little more expensive then some, but they are the best. Thank-you for putting out a great product that is a valuable investment for hard-earned money!
Reviewed by Dust:
Great Product, run the small engine oil in my Kohler whole house Generator.. runs cooler , quieter and I know I'm using the best oil between change intervals... also I have a 2005 F150 with the 5.4 Triton Engine.. everyone knows about the problems with these motors.. switched over to Signiture 5w-30 a couple years ago.. runs a lot quieter , cooler and just seems to purr .. yes I know the motor specs 5w-20 but it does honestly run better and have had 0 issues with the motor.. ... Bought truck new in 2005..
Reviewed by Greg:
Use it in everthing
Reviewed by none:
I use Amsoil because it is the best oil. I recommend it to all my friends.
Reviewed by Phil:
I will only use Amsoil lubricants in my vehicles and power equipment. Amsoil products are the best protection I can get and give my investments.
Reviewed by Mike:
Had royal purple in my wife's Dodge Durango 5.7 V8. If it sat for a few days and I started it I could hear a valve knock that lasted a few seconds and sounded bad. I've had this amsoil in with amsoil oil filter and I can leave it sitting for a week and start up sounds completely normal. I can tell I'm getting proper lubrication and I trust amsoil because of it. Also put it in my Cummins diesel and it's smooth as glass as well. I think I'm amsoil for life.
Reviewed by Pontiac 6:
I have been using Amsoil oil and filters for about 20 years and in my opinion they are the best on the market. I ran a 2001 Chevy Blazer 25K miles between changes with absolutely no problems and it was still running perfectly with 109K miles on it when I sold it.
Reviewed by Josh:
I use this oil in my 98 wrangler works great
Reviewed by VQ35DE:
She still beats a GT Mustang after 14 years, running Amsoil since the start
Reviewed by AmsoilGuy78:
I run this in all of my vehicles. It is worth every penny for sure! You won't regret buying this.
Reviewed by Timothy A SFC RET:
Phenomenal product that is worth the price. Yes it is expensive initially, but it has stood up to some hard usage with issues. 20K oil? Bet on it!
Reviewed by Adil Ejaz:
This is the best oil I have ever used
Reviewed by Stephen:
Using Amsoil products for over 20 years and nothing else...
Reviewed by Ain't got time:
I use Amsoil, dual bypass oil filtration, and test lab analysis to support extended oil changes. Lab analysis has shown me I can run almost 40K miles without changing oil. I sometimes drive 1000 miles a week or more for my job; and monthly oil changes simply don't cut it. Amsoil does. I spare not the miles and trust Amsoil to go the distance; I have independent lab analysis to demonstrate it.
Reviewed by Mr Ed:
It's the ONLY oil I will allow to be used for my Shelby GT 500! Provides the greatest protection for the high performance engine!
Reviewed by Asphalt F150:
I use this oil in my 2013 F150 with the eco-boost 3.5L engine. Truck burns or uses zero oil between oil changes(once a year). I only drive about 7,000 miles a year. I use Amsoil because I know Amsoil makes the best products available.
Reviewed by Bubba:
Been using AMSOIL since the 70's in many cars and trucks. Sold one truck to a mechanic after 204K miles. He said it was the cleanest engine he' ever seen.
Reviewed by rrigsby24:
Customer for 7 months. I can't say anything someone else hasn't said already. This was for my Dad's girlfriend car. We have my truck, his truck, her SUV, my mower all on amsoil. My truck is all done. Engine, tranny, rear end, transfer case. Waiting to put in coolant. It sells itself. They say everything drives.i use signature series and will never use anything else in any motor I ever own.dealerahips can say whatever they want, just stinks you have to change within a certain mileage to keep warranty cause this oil goes forever compared to rest. Use it and see!!!!
Reviewed by Sierra owner 12:
I chose to go 0-40 for both cold flow and film strength at the running temps. Motor is getting cleaner every oil change and is running great. I tow with confidence and will continue to run the first in synthetics
Reviewed by TM:
After switching over to AMSOIL Signiture Series 5W30 in my '07 Prius, I couldn't be happier. The gas motor is running very smoothly and more efficiently since I have owned it! Not too shabby considering it has 124K+ miles on it! This oil is the real deal. If you are serious about keeping your car in the best condition for as long as possible, there isn't a better oil out there that can deliver on that than AMSOIL.
Reviewed by Mike T:
Back in 2006 I have swivhed from other brands to Amsoil. Based on some independent test results, and most importantly a friend. Who have tested his 12000 mile oil being Amsoil, on 45000 mile vehicle, that used amsoil since new. Test results sugested fillowing: 1) oil is 6000-7000 mile old 2) engine is 15000-25000 miles old 3) if lubrication continues as before, engine should ladt over 300000 miles.
That was enough info for me to switch, also Mobil 1 that I was using at the time, came with less promising test results.
Since the switch I have been using Amsoil in every car, and truck I owned. Never had a failure due to lubrication. And most importantly have saved a bunch of money, on changing oil once per year. Signature series, along with EA filter can last up to 25000 miles. I would never go past 15000
miles.
Reviewed by Duff:
I have a 05 ram 2500 HD 250000 miles on it still runs like a dream
Reviewed by John:
I used this blend for years until I changed to the European blend and it worked very well ....
Reviewed by Mario:
Good
Reviewed by Nick/repair tech/enthusiast:
The highest quality oil for everything with and engine, hands down.
Reviewed by Big Al:
I've used Amsoil over the last 30 plus years and never had a problem with any of the product. I use it in offroad vehicles, 4x4 Jeeps, turbo charged engines, NA engines and anything else that benefits from a high quality synthetic lubricant.
Reviewed by Hubert:
I have been using Amsoil 100% synthetic engine oils in all my cars, my wife cars since 1984.
At first it was 10w-40 AMO, then in 2002 I switched to 5w-30 ASL. I refuse to use the 5w-20 and 0w-20
oil, I feel my engine is better protected with the 5w-30. I also use the oil filters, the grease.
They are simply high quality, great products and the service is great. I order online via the Amsoil website since 2001. I get my order within a couple of days, and there is never any mistakes.
Reviewed by Tads Subaru:
I have used Amsoil signature oil for over a 100,000 miles in my vehicle. I tried other oils but they did not last or perform up to my standards.
Reviewed by Racing girl:
I can go a long time between oil changes with the signature series 5W 20 oil, it is amazing how much better my truck has been running since I have been using it. I haven't found a con with it yet, just all pros!
Reviewed by Jay:
I have used Amsoil for many years, I use it in all my vehicles everything from my daily driver to my classic and antique cars, I even order it for my friends and family who all love how it works and the convenience of use ie. Once a year oil change.
Reviewed by Sacco:
.............. .............
Reviewed by Larry:
AMSOIL Signature Series 5W-30 Motor Oil
keeps my car running smoothly.
Reviewed by Animal:
This product has Pierier antiwear property is
Reviewed by Chuck:
I've been using Amsoil oil for more than 20 years so when I bought a used 2011 Toyota Highlander that requires 0W20 oil I chose Amsoil Signature. I noticed that the my SUV used less oil with Amsoil compared to whatever the dealership put in it. I've had several vehicles that even after 10,000 miles used virtually no oil when using Amsoil.
Reviewed by None:
I have been using Amsoil for years. Commutes for me is 40 to 50 kms oneway and I can run Amsoil and never have to add oil. Had an old car overheat in Calgary one summer due to traffic on the deerfoot trail and there was no problem afterwards with the car or the oil.
Reviewed by Trevor:
I have used this product for years, it gives my vehicles top notch protection!
Reviewed by Harley Cop:
I have used Amsoil products since 2003. Never a problem. I have recommended it to friends without any qualms.
Reviewed by DJM:
Ever since discovering this oil in 2005 I've never used anything else, and it's never let me down. 15k miles between oil changes and it's still gold in color not black like others.
Reviewed by Chris:
I use the product in my 2013 Dodge Ram 5.7L.
I believe I have increased fuel mileage and the truck runs great!
Reviewed by DoubleD:
I have used amsoil in my motorcycle and personal vehicles for years. All of them perform perfectly.
Reviewed by Lando:
Product works amazing! No issues
Reviewed by Ernie:
Love the oil never had issues power foam is the best out there if ya know how to use it correctly.. very happy with the results and products..
Reviewed by Andy:
Amsoil is de bessss!
Reviewed by Smilinjack:
Smilinjack has been using AMSOIL 1030,1040 2Cycle oil, Power Foam, oil and air filters and Performance Improver continually since 1979. Once we tried it, have never ever needed or used anything else. Automotive use, lawnmower, lawn tractor, boat motors and my portable generator all perform well with AmsOil in the crankcase. Excellent products. Knew a good thing when we first found it and will never go to anything else. EOM
Reviewed by Joe:
Great product, love the extended drain capability.
Reviewed by Tom:
I have been using Amsoil in every vehicle I have owned for the past 15 years. I like the extra protection and only changing oil once a year.
Reviewed by Robert:
your car runs great
Reviewed by Brian:
I just had a 600 horse 460 Ford built and put in my truck and this oil is the best insurance for a hydraulic roller cam motor in my honest opinion..
Reviewed by Rob:
This product goes in all my vehicles!
Reviewed by Alex:
Used it in my 2015 Ford Fiesta rally car. Seems to be working.
will buy again in couple months when time
comes to change oil and filter!
Reviewed by Mack:
Well, I am not the guy who owns a mega-truck or 5 SUV's. I have the "love of my life" who's stuck with me for 38 years and a major cardiac failure. My goal is to make sure that this investment of my life sticks around for awhile. Everyday she gets in her 2013 Honda CR-V and takes to the roads. Her rig WILL have the BEST I can afford protecting her. This is why when it comes to the products you make, they will be used. When the BEST is used there is no need for excuses!
Reviewed by Craig Sr.:
I have been around cars and trucks since I was 11 years old...rebuilding, normal maintenance, restoring, and mechanical. At almost 70 I can tell you that my pride and joy is a 1998 Chrysler Town & Country LXI mini van. I proudly have 385K Amsoil miles and it still runs like new. I get exceptional mileage, no smoke from exhaust, no rough idling, no engine noise (that most older motors get), and can say after sitting in the drivers seat all those miles...I still love to drive it and see what new gets better! I am constantly surprised at how smooth a quiet the motor runs. When I take it get my tires rotated they always comment on how well it runs...here is the irony. When trying to explain about additives there is a blank look as people just don't understand that synthetic oil is engineered not manufactured. A lot of time, research dollars, and effort has gone into the making of each product. I will always explain the benefits of Amsoil when asked...just get tired of people that are ignorant to the science and technology that has made this product what it is. I have been a 20+ year user and will always continue! Thanks Amsoil for sticking to your desire to be the best!
Reviewed by Dennis:
I use this in all my car's and trucks
Reviewed by Derek:
Best oil on the market!
Canada
United States
Great Oil
I use this on my 2008 Volvo C30R with 166000 miles. Engine runs smoothly with amsoil.