Product Reviewed: Signature Series Motor Oils
Current Rating: 4.97 out of 5 stars
Votes & Reviews: 407 vote(s) and 1145 user reviews.
Reviewed by Acdelco: 
Use this in 2 cars & 1 truck have over 105000 miles on Pt Cruiser, engine is quiet, & doesn't burn oil.
Reviewed by Toyotaholic:
2006 Toyota Corolla. 250k miles with only 10 oil changes. The engine still going without any issues. Now I use it on my 07 Fj cruiser and my 15 Toyota Corolla.
Reviewed by Jeffrey:
I have used Sig series 5W30 for the last 100000 miles on my 2003 Lexus es.Just had valve cover gaskets replaced.Tech said engine looked like new inside with valve covers removed..
Reviewed by Fernando:
My vehicle runs great
Reviewed by Manny:
I have been using AMSOIL Synthetic oils in my vehicles for over 10 years. Two Saturns (a 2000 SL2 & a 2002 SC2), Two Hyundai Elantras (2014 & 2017), and a GM Sonic (2015) . I have never had an oil related problem with any of the engines. There was significant affect on the LACK or wear on all of the engines I would recommend AMSOIL them to anyone who purchases a new car, or a used car with not many miles on it.
P.S. I have been buying NEW automobiles since 1970. I switched to AMSOIL synthetic motor oils in 2004, and have never used anything else in my automobiles (and my lawn mowers).
Reviewed by Chuck:
Used Amsoil OW-20 oil in the last two Hondas I've owned and currently in my 2017 Honda Civic turbo. Aside from the fact that Honda makes a very durable Vehicle the use of Amsoil OW-20 has without question lengthened the lifespan of my vehicles. I put close to 200,000 miles on the previous Honda's I owned and expect with normal maintenance to do the same or even better with my current Honda.
Reviewed by Barry:
Wouldn't think about any other product for my 2007 Silverado that has 223,000 miles on it. I started using it back when i purchased my first new 2000 Silverado and have used it ever since.
Reviewed by Timmy:
I have been running Signature Series Synthetic Motor Oil in my 2010 FJ Cruiser (4.0 V-6) since it was new. The vehicle now has 146,000 miles on it. I drive 140 miles per day for work, towing a small boat for part of the commute. I consider the use of my vehicle pretty strenuous considering 1000 plus feet of elevation change, temps from 0 degrees to 105, all on horrible highways from the desert to the mountains,
including a little off road crawling. I grew up around garages and race cars and do my own maintenance / oil changes and am always impressed with how good the oil looks when I drain it, even after max mileage intervals. I have had zero mechanical issues and get the same fuel mileage as when the truck was new. The one time I had a shop change my oil due to time constraints and other service, the mechanic commented the used oil looked and felt fantastic still, at 12,000 miles.
I use Amsoil products everywhere I can......tranny, differentials, transfer case. I'm sold on Signature Series Oil for all of my rigs, and sold on the people and service I get from Amsoil.
Reviewed by Ed:
Awesome oil. Makes my Cecile run smoother and quieter. I love Amsoil.
Reviewed by H20EXPLORER:
In my 19 year old truck with 257000 miles, the performance improvement is noticeable.
Reviewed by JD:
Started using the Signature Oils last year. I can tell the difference from regular synthetic oil. In the long run it's probably less expensive to use the Signature because of more then double the change interval.
Reviewed by Mike:
You can't beat Amsoil, and at the price when you become a preferred member, the price is as good or better than most other oils.
Reviewed by Josh:
Amsoil products are constantly the highest quality and the best protection for all my vehicles. It has revived and made my daily driver (over 20 year old vehicle) run like a top. It is the prefect addition to any vehicle that you want to get long use out of, and regardless of the environment have the best protection for your engine.
Reviewed by Pepe:
Always heard about it in the past, but never tried it. Finally tried it and will always use it!!!
Reviewed by Gutsi:
I've been using Amsoil in all my cars (6) for over 10 years. My 07 Honda Fit just turned 400k miles and is going strong, along with all my other cars running Amsoil. And I save money by only having to change the oil every 15k miles. Excellent product that actually saves me money in the long run.
Reviewed by Mk:
I drive 150 miles daily and amsoil helps my engine run smooth and cool.. Even when I'm due to change it feels like oil not syrup... Great price for a great product.. would buy amsoil again and again.. Thanks amsoil
Reviewed by Tony:
Have previously trid various oils in my 2012 Boss 302 & Amsoil 5/50 is been my choice since it came out .Great Stuff''''''
Reviewed by Ken:
I installed 5-30 Sig in my Tahoe last May. Through this May I completed 10,000 miles including through a winter here in Northern Michigan. The shop I use was touting another oil and warned me that no oil could be used all winter in multiple cold or very cold start conditions and last through the whole winter. Well, I had the oil tested after a year and even in this harsh environment, the oil still had 3,000 to 5,000 miles of life left. Kudos to the product. Yes the Tahoe does use some oil--maybe 3 quarts total over that period, but it did amaze me that the oil held up and was still good after a year. Fuel economy on a road trip to Rochester, MN with a change of trans fluid to Amsoil synthetic showed an increase in mileage from about 19 to a solid 21-22 MPG. Fluids are the only change and this vehicle is otherwise a gas hog.
Reviewed by Short Circuit:
I have used this product for over 20 years. I have actually torn down an engine (oil pump shaft broke) that I used this oil in close to its whole life and the internals of the engine were remarkable. They showed very little wear and tear and none of the typical deposits you would see in an engine with 135,000 miles on. I know there is a lot of churn about who's best and so on but speaking for this oil it's worth every penny. Your buying peace of mind.
Reviewed by Jerry:
Good product
Reviewed by Pgf1:
I have recently changed to this after considerable research,
Reviewed by Lee:
Since I start using Amsoil signature zero 20 100% synthetic oil on my truck start ups Are much quicker and Engine runs more smoother and more power.My gas mileage has improved significantly
Reviewed by Ed:
Start using AMS oil 10 years ago. After 250,000 miles car is still running great.
Reviewed by Theron:
Lots of confidence
Reviewed by Don the mechanic:
This Product saves money. It gives you great protection for your engine over a longer period of time, so you do not have to change it as often.When used with the Amsoil Ea Oil filter, it does even a better job. So in the long run it is more economical to use.
Reviewed by ED:
As I have gotten older I like how I now only have to change the oil only once a year. I take care of 6 cars (mine and my kids) so this really helps me do other things besides changing oil.
Reviewed by John:
Long life offered
Reviewed by Lambshark:
Been using Amsoil for years with awesome success. I always use their oil filters as well.
Reviewed by Harvdog:
We love the oil , filters and grease. Currently we have just over 411,000 miles on our 2004 Honda Element. Thanks for providing such a high quality lubricant.
Reviewed by Tito:
I use this product in my vehicles that specify 0W-20. Since switching, the engines are much quieter and seem to run cooler.
Reviewed by Mike:
I've been using Amsoil Signature Series in my 2010 Toyota truck exclusively. Eight years later and 200,000 km later it still runs like new. I wouldn't think of using anything else.
Reviewed by Satisfied:
Great for my new air-cooled Generac 11kW automatic backup generator. It was consuming another well-known brand of synthetic 5w-30EP oil at an unacceptably excessive rate. After researching the various oil properties and what others with air-cooled generators down in hurricane country use, I decided to try Amsoil 5w-50. After switching my oil consumption completely stopped. I use it or Amsoil 0W-40 in all my small engines now.
Reviewed by David:
Amazing product so good im happy i made the right Choice
Reviewed by PJ:
I started using this about a year ago and now have in my two motorcycles, my fiancés bike and a couple of friends.
Reviewed by CJ:
The Amsoil Products not only protect my vehichle to the highest standards,they save me time and money.
Reviewed by Jeff:
We have used Amsoil products in all of our vehicles for the past 8 years. The engine in our 2010 Equinox is still running strong with 155,000 Amsoil miles. We have used the Signature Series 5W-30 for the past 75 of so and even with the high mileage we lose almost no oil between changes. We do change at about 12K to 15K though due to the heat in the summers of central Virginia.
Reviewed by Gary B:
I use this in all for vehicles I own for the last 20 years. My V10 Motor Home, my Hemi SUV, my V-6 convertible beach cruiser and my classic convertible street rod. Extremely versatile and has never let me down.
Reviewed by Anson:
I've been using amsoil 35 years, I believe it's what gave me 450000 miles on on a 77 Porsche. Today I used it in my 18 Kia soul turbo and 16 Kia turbo koup, read the specs it's the best oil for any application.
Reviewed by BATMAN:
This is the only oil I use in all of my vehicles.
Reviewed by Scott:
My engine has 245,000 miles on it, (second engine in the car) and I have used Amsoil for about 2 years. I recently had an oil analysis by Blackstone Labs, and they told me that the wear I had represented about 5,800 miles, but I had actually 22,600 miles on that oil change!! I could have run until 25,000 miles, so next time I will.
Reviewed by TDR:
Use this in my 2017 Kia 3.3 and like that I save money with my longer oil change interval.
Reviewed by Mike:
My vehicles never run better. I like the convenience of changing my oil once a year.
Reviewed by Ed:
I have been in the automotive industry for 45 years and have seen all kinds of oil and lubricants. Many claim amazing things. My personal experience with Amsoil has been long term. First my race bike. Nothing compared to the performance of Amsoil. Runs cooler, lasts longer, overall good results. My truck now has 343000 miles. Still does not use any oil. My Harley picked up 3 miles/gallon and runs cooler.
Reviewed by Tommy:
Great product
Reviewed by Tone Capone:
Amsoil is the only well we use in our cars. Are even got my family and some of my friends to switch
Reviewed by Loop:
Great oil
Reviewed by Dave:
Here in Edmonton, Alberta. We've got crazy And confusing weather. The cold gets up to -50 So this Oil does Absolutely great performance. You've gotta have this in coldest weather.
Reviewed by Corvette Mike:
Just recently changed my C6 Corvette to Amsoil. Looking for cooler operating temps and the reduction of lifter noise on cold starts. Took a 200 mile trip ran about the same temps as my previous synthetic oil. Engine seems a little quieter with cold starts. The cruising season is just getting started her in Ohio. The true test will be when I track the car at some of our clubs autocross races and high speed events. Two other friends have witnessed improvements with this product and switched based on their recommendations. They both race frequently and push their Vettes to the limit without any issues.
Reviewed by juicey
j:
seems to be working good. I put a 100,000 miles a year on. does not keep engine as clean as redline. lots of varnish from amsoil at the 100,000 mile mark. redline at a 100,000 looks just like knew inside the engine.
Reviewed by Larry:
I started using this oil many years ago. When first bought it I used your oil filter and oil I put in my Ford 150 pickup truck 2002. I left in my truck for 6 weeks and drained the OIl and put in new filter and oil this cleaned the inside of my motor now the oil stays very clean. I now have over 363,000 miles on my truck still running strong
Reviewed by windom:
Amsoil oil is amazing. You are the best.
Reviewed by Nosocs:
I use in a 1999 Acura CL/3.0 coupe...starteed @ 40,000, and have used for last 180,000...car has 220,000, and runs as shmooov as any vehicle out there....@ 185,000, I changed the transmission fluid, using AMSOIL transmission fluid...aGain.....shmoove shifting....Best product for any vehicle!
Reviewed by Jake:
Best synthetic on the market. It's the only thing I use in my truck.
Reviewed by Serge:
As always, AMSOil didn't disappoint. Ordered this for my mom's 2016 Honda Accord.
Reviewed by Jose the big burrito:
Super impressed with all The Amsoil products. Extebdes oil change intervals makes it a no-brainer.
vehicle
Vehicle runs so much smoother, better gas mileage, it's a win-win
Reviewed by Tony:
Use for my car
Reviewed by Mel:
I always say that if Amsoil don't know how to make Synthetic Oil NO ONE does..
Because they have been the first since 1972..
Reviewed by rdj519:
300000 miles with once a year oil change. Amsol is the best
Reviewed by ...:
Great products
Reviewed by Rusty:
I use Amsoil in everything machine I own. That Amounts to one diesel pickup to three gas pic up and two mustangs one being a 2011 Shelby GT500
Reviewed by Dennis Oldblood:
Amsoil protect my crankshaft when my oil pump failed and I get better gas milage, epa rating for my car is 35 mpg and I repeatedly hit 40 mpg.
Reviewed by Chris:
2010 Toyota sequioa w/ 200k on the clock.
Doubled oil change interval to 10k, doesn't use a drop between changes. Frequently idle and tow in hot Mississippi weather. Noticeably quieter valve operation over other top shelf synthetics. I just did a 200k service and noticed there is zero sludge in the engine. It was as sparkly as a transmission.
I expect 300-400k out of this engine but it is a Toyota not a Ford!
Reviewed by Los:
The best oil I've ever used.! Hands down!
Reviewed by Poncho pete:
2013 Kia Rio o my has a 3.5 qt capacity. Best oil I've seen for this scenario
Reviewed by Tim:
Only Oil I will every use on my high performance cars
Reviewed by Chance:
Used for engines and trans. I researched oil products IE: Royal Purple, Mobil 1, and Amsoil. Amsoil won.
Reviewed by Brian:
On thanks
Reviewed by Rob:
My new Outback calls for 0-20 oil. This is a difficult thing to believe in considering I am old sckool and would rather have a heavier oil in the motor.
So if I am going to put thin oil in this new car, then I want the best I can get.
I been using AmsOil products for a while now and have no complaints .
Reviewed by Ryan:
My 302 race engine loves it! My old oil would barely last 1,500 miles but signature series is still golden after 5k! Thinging about swithing everything i have to it and see how a stock engine does up to 15,000!
Reviewed by Hawk:
The best oil I have ever used and I tell everyone I know.
Reviewed by Dan the man:
For the long mileage & city
Reviewed by Joe:
Unlike other oils I have tried in the past this stuff seems to work very well in my 5.3 liter vortex, she runs much quieter and cooler then before, I was a big a mobile 1 user before trying the amsoil and I've been using it ever since.
If you rilly listen to you engine it will tell you what it likes, while that may sound crazy to some people to me this stuff is definitely approved by my motor lol. It is good stuff a bit pricey but you will get what you pay for with
this product there's no dought kn my mind.
Reviewed by Jim:
I bought SS 5W-30 and a 15K filter for less than 4 oil changes
Reviewed by B:
Amazing products. Will not run anything else in my vehicles, atvs, snowmobiles.
Reviewed by DonV:
When changing oil in a turbo engine the new formula Amsoil Signature series is a no-brainer!!
Reviewed by 392 SRT:
I was introduced to AMSOIL in 1989 and ever since then it's all I use. I've had dealerships and Auto parts houses try to sell me Royal Purple and Penzoil and Mobil One and I stop them before they even get going good. And I tell them, "Sorry that you like trashy oil in your prized possessions but as for me I only run the best, and that's Amsoil. It's been around since the 60's and it's never failed. So, why not use something that stands the test of TIME!!? That's why I use it, I "Know" it won't fail."
Reviewed by Oldfogey:
Run it in every vehicle I own and my kids. Best product on the market
Reviewed by Larzman:
Product is terrific. Improved engine idling & gas mileage. Good engine wear too! Shooting for 300k & beyond!
Reviewed by mike:
Time in between changes
Reviewed by H.d. Hood Jr.:
Works great lasts a long time !!!! Over priced though
Reviewed by Ironrail:
We have a 2016 Honda Pilot and a 2014 Jeep Gtand Cherokee. The Pilot gets 28 mpg and the Jeep gets 24. I truelly believe it's because of AMSOIL. When we picked up my wife's Pilot from the dealer I told her that within 30 days i'll have it running so smooth that she won't know that it's running. She gave me the bonehead look. Long story short, both vehicles run as smooth as silk and the mpg's are higher since AMSOIL. Not long ago i got into her truck and i didn't know it was running. I asked her if she was going to start the truck before we leave for our trip. That's basically how the story goes for all of our cars; lawn equipment and anything that uses oil. It's the best you can get.
Reviewed by Kyle:
My vehicles definitely feels it has more performance.
Reviewed by Jeff:
Use in my Toyota Tundra since new 2006! 270,000 mi. Great protection, runs well & very consistent!
Reviewed by Andy:
Use it in my 2000 Honda civic SI with 220000 miles on it. Still runs like a champ.
Reviewed by Bill:
It's the best
Reviewed by Shawn and Patricia:
Best synthetic oil in the world it's the best and only oil we use.
Reviewed by Dale:
This product is awesome, since I do not put many miles on my vehicles, with getting a Demo from work, it is nice to only have to change the oil in all of my vehicles once a year and know that it comes out as clean as new when I drain it! Superior product and highly recommend!
Reviewed by Coulee:
Great oil, change it once a year. Been buying Amsoil since 1980, first as just a customer and then as preferred. I use only Amsoil oils, gear oils in tractor, small engines.
Reviewed by Clint:
Awesome oil! After changing the oil in my wife traverse to Amsoil everything has been running smoother. The only down side is sometimes my wife will start the car waiting for me to leave the house, I'll get in the car and try and crank it again because I cant hear the engine running it's so quiet now.
Reviewed by Mark:
I use it in my 2 wheel drive 4Runner and have 273,000 miles on the car all with AMSOIL.
Reviewed by George:
Amazing oil for the Toyota FJ. FJ ran better and oil at change interval didn't seem as dark.
Reviewed by Nathan:
Have been using in my last 3 vehicles
Reviewed by Imy:
Works as designed; and extends oil changes intervals
Reviewed by Imy:
Gain in mpg and more miles/time before maintenance intervals
Reviewed by Maiden Youesa:
I just changed the oil in both my rides and loves the quiet smooth sound when running my signature series.
Reviewed by Kevhead:
I started using amzoil products before being called amsoil. I use the signature series oil and Eo and Eat filters. I change my oil once/yr. And I literally do not burn any oil in that yr. With my 00' tundra V8 using amsoil. My 02
Reviewed by workamper:
Nothing on the market that beats it
Reviewed by Rick:
This is the only kind of oil that I will use in my vehicles
Reviewed by Drew:
I own 2003 s2000 that I recently rebuilt the cylinder head on. Prior to the rebuild the car was turboed for a decent amount of time. The car currently sits around 112k miles at the moment after the rebuild. The car has been running Amsoil signature series for most of its life. When I inspected the camshaft, cylinder walls, etc during the rebuild the car showed absolutely no sign of wear anywhere and this is after being turboed and ran hard for a decent amount of time. I moved back to 10w30 signature series after the rebuild but still great stuff.
Canada
United States
I would buy this product again.
Switched to using Amsoil and noticed a difference immediately at how quiet the engine sounded. I also noticed a bump in fuel mileage.
I currently have a 2007 Mazda 3s with 115,000 miles on it and used Amsoil since it was new and it has never had any oil related problems or leaks.