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 Edward: 
Using this oil for past 5 years for our three Toyotas. The best oil so fur.
Reviewed by James:
Great products
Reviewed by Rex:
I have used the Signature Series oil for many years. I only change it once a year on all my vehicles which will approach 25,000 miles on average.
This is the only oil I will use and it has been fantastic!
Reviewed by Michelle:
Love this stuff!
Reviewed by Manuel:
Happy with the AMSOIL Signature 0W-20 Synthetic motor oil. Been using it for many years.
Reviewed by Brian:
I have used this oil on my 1996 Chevy Silverado 2500 since it was new. No issues with the motor and runs as smooth as when it was new.
Reviewed by Roman:
Great oil
Reviewed by John:
have used this product for 5 years and have had no related problem with this oil.
Reviewed by Jomel:
Accurate and tested to be one of the best motor oil.
Reviewed by Kenny:
Happy love it I have been using this product for years fantastic
Reviewed by David:
Since iv placed Amsoil in my car she has improved alot! I love how the oil doesnt burn as fast even with my girl having increased HP. You want better oil for your car...i highly recommend this one.
Reviewed by Steve:
work truck and cars
Reviewed by Mark:
Purchased for a Ram 2500 with 6.4 as an alternative to factory oil. Has been excellent so far!
Reviewed by Raymond:
I switched over from 5w20 to 0w30 because I use my 13 Ram 5.7 Hemi engine for towing ,this engine runs great, went on vacation this April to Tennessee, didn't Tow any thing my average millage is now (Hwy)19.2,this is Great the engine just feels good,been using Amsoil since 1988.
Reviewed by Alexander:
Right for the Tundra!
Reviewed by Alexander:
Right for the Shelby
Reviewed by Jay:
I use signature 5W 30 in my 2007 Range Rover Sport Super Charged. I will not use any other brand, the truck has had regular oil in it from factory to the 5000 mile mark, since then we have only used Amsoil signature synthetic and rightfully so the Range Rover has 245k miles and it' still as strong as the first week we owned it. Thank you Mr Amsoil.
Reviewed by David:
I use this in my new car.
Reviewed by David:
Makes my generator run quieter
Reviewed by David:
I use Amsoil exclusively.
Reviewed by Lorenz:
So i had the oil run for almost 4000 kms 24/16 hwy/city km driving everyday. I lost about eight of an inch on my dipstick reading and it looks like the oil is not gonna last for whatever you guys claimed. I will do my oil change soon and will use oem filter instead of wix see if it will make any difference
Reviewed by Dan:
Great product with great service
Reviewed by David:
I uesd amsoil in my mother car. Did a engine flush. With her oil change. When it was done. She drove to her house which is up a mountain. She notice right away how smooth the engine running. Big difference she said. Thats from a women who dosent know about different oils.
Reviewed by Roy:
Product used in 2014 Fusion HYbrid. Fuel mileage improved 3 mpg and engine so quiet you think you are on battery.
Reviewed by Roy:
Product used in a 2016 Mustang GT with Roush supercharger. 690 HP which is up from 670 on factory oil.
If you cant feel the difference using AMsoil, dont ride a bicycle, motorcycle, or fly an airplane!
Reviewed by Dominic:
My Toyota RAV4 runs smoother with better fuel economy that it did with the MOBIL Full Synthetic that was being used previously. This oil is also used in my Cummins whole house generator. Engine runs smooth and quieter.
Reviewed by George:
I know that Amsoil is relentless in producing the finest motor oil anyone can purchase for vertually any vehicle. My high performance car still runs like new with no issues using Amsoil SSO 5W-20 for the last ten years.
Reviewed by Bryan:
Every six months oil change intervals at 10,000 miles with Amsoil's oil filter. UOA came back showing the oil had plenty of life left in it. 10,000 and every six months is where I feel comfortable.
Reviewed by Joseph:
Run this in my 2016 Subaru legacy 2.5 and works well
Reviewed by Robert:
Best product, fast shipping.
Reviewed by Robert:
Heavy duty 50,000 miles year plus idling time
Reviewed by Brett:
AMSOIL customer for 20 years. Outstanding products. Best engine oil products available.
Reviewed by Duane:
Love the long life of the oil. Still retains lubrication quality after a year in use.
Reviewed by Larry:
I use it a2005 Mercury, it was what he used so I just kept using it, it has around 220500 miles on it and I think the rear seal has a little leak. I also us Am soil in my Harley and has made a difference . I have also bought it for my 93 diesel I am working on.
Reviewed by Daniel:
I been using this in a 2016 Chevy Trax from new! uses on oil @ 53'600 miles!
Reviewed by Austen:
Running smoother and cooler, hardly any burn off and keeps the inside nice and clean.
Reviewed by Franco:
Seems like a great product gas mileage improved about 1-2 miles per gallon hiway engine sounds slightly quieter
Reviewed by Eric:
I feel the AMSOIL 5/30 is the best protection for my engine.
Reviewed by Josh:
I use it in my truck and it last a long time before I have to change the oil again it pays to use the good stuff
Reviewed by David:
I like that I Can count on quality.
Reviewed by Dave:
Awesome oil,
Reviewed by Vance:
Good oil I won't use anything else in my 2018 Camaro ZL1!
Reviewed by Vance:
Very happy with this oil so far! I accumulate a lot of miles weekly and I'm tired of changing my oil every month. So I ready to pay more to get more. Keep up the good work!
Reviewed by Anthony:
I've been using this Amzoil premium synthetic oil for 2 years and have been very happy with it. My car is turbocharged and runs smooth and cool with this oil.
Reviewed by Cliff:
This product is in my wife's car, which puts me at ease, she won't have problems while traveling.
Reviewed by Cheryl:
Love it,great product.
Reviewed by Bernardo:
Great product, my Ford Transit 3.7 engine runs very quiet and smooth.
Like never before.
Reviewed by Saverio:
Great product! Won't use anything else.
Reviewed by W.H.:
It works great in my 2018 Silverado. Been using your product from 1980. Wood not uses anything esle.
Reviewed by John:
car runs with more pep
Reviewed by Stephen:
Like all things I'm skeptical, but The signature series has proven its worth both in cost and in performance. I've been given nothing but superior results by this product. Both my trucks have it in them and both run smoother and quieter and with just this change have shown better gas mileage.
Reviewed by Guenther:
use on all my high mileage vehicals...i get about an extra miles more per gallon on average per tank, so big cost savings, plus i only change oil once a year!!
Reviewed by Tere:
We love using this oil.
Reviewed by Jack:
changed oil.
Reviewed by Bernardino:
Use for Subaru Crosstrek average fuel consumption 27mpg..now 30.2mpg!
Reviewed by Jeff:
I have always used this product in my Honda Civic. My car has 168k miles on and it runs great. You will be ready for a new car before you engine wears out.
Reviewed by Romie:
Since I used this product I'be been changing my car oil every 7000 miles and the oil is still free flowing even @ 7000.
Reviewed by Michael:
I have put nothing but Amsoil in my vehicles. This is for 2018 Denali with 6.2 liter. Try to keep it running like new for years to come
Reviewed by David:
Have used it for years and works great
Reviewed by Joey:
Was nervous about using thicker oil in Prius, but glad I did. With my miles getting higher, Amsoil has done wonders to my car. Going to continue using all Amsoil products for my vehicles.
Reviewed by James:
Outstanding product that I have used in my 2012 GMC Terrain V-6 since I purchased it 89,000 miles ago. I change once a year and put about 12-15 thousand miles per year on the car and the EA filter. Never any issues and NO significant oil loss each year.
Reviewed by Doyle:
Great product, it's a 2 hour round trip to do a oil change in my rural area. Doing it myself + the extended service miles is very welcome.
Reviewed by Perry:
Used to use other top tier oils and after hearing that Amsoil is real 100% synthetic oil and not that bogus misleading "Full Synthetic" I switched to the real 100% synthetic Signature Series 0w20, Started doing my own oil changes on my Lifted truck, found that other oils at 4K miles were literally black but Amsoil was much lighter in color proving that it takes much more abuse. Amsoil is a Super Oil
Reviewed by Blake:
Great product!
Reviewed by Rafael:
Put it n my mustang and works amazingly!
Reviewed by Leo:
I have to say its is the best I ever used, but I want to have the oil tested to what is going on in my cars engine, as I said my car is running smoother than ever I still think it beats all other oils.
Reviewed by Ty:
Great Oil
Reviewed by Ty:
Great oil. I have over 200000 miles on my SUV
Reviewed by Frank:
I put a 5/30 in my 2016 eco diesel. It's the best oil on the market for that Ram
Reviewed by Robert:
It's all good ! When you run with the Best you can forget about the rest
Reviewed by Kenneth:
Excellent product!
Reviewed by Marty:
The best of the best
Reviewed by Richard:
This is the only oil I use-and always will..........................
Reviewed by Raider Rodney:
I researched oil and tests for years before deciding on going with Amsoil's Signature Series for my DSM. The testing speaks for itself, less wear, better performance...period.
Reviewed by Dan:
Only once a year, perfect, saves time and money, the old stuff comes out cleaner than conventional oil would, and I know it would last longer.
Reviewed by Lance:
Used in my wife's 2017 Ram 2500. Switched a year ago and noticed increased mpg. Great product!
Reviewed by Henry:
Use n every vehicle I have for many years. Great products
Reviewed by Joseph:
Use this in my daughters honda civic she loves the once a year oil changes
Reviewed by Gene:
I use Amsoil Signature Series oil exclusively in my 2007 Expedition and my 2010 F150. Love the protection and improved performance in both vehicles.
Reviewed by Jayson:
Great product....great protection.
Reviewed by Keith:
Use this oil in my 2003 S-10 2.2 and have 576,198 miles original motor
Reviewed by Juan:
I love this oil. I will be using this oil on my wife's vehicle next oil change. The only thing I don't like is I need to add 1 to 2 quarts of oil before the next the oil change. Over all LOVE it.
Reviewed by Peter:
I use AMSOIL products---particularly oils in every vehicle that I have owned since 1968! This is an excellent product. I have never had a hitch or failure using ANY of the products. All my relatives and friends are convinced converts! It is comforting not to have any worry about your lubricants, regardless of their use.
Reviewed by Tony:
I switched to Amsoil full synthetic after experiencing some sluggish cold weather starts using the competitors conventional oil. Now I have quicker cold weather starts and great warm weather protection. I have not only switched my trucks to Amsoil but also my boat and four wheelers.
Reviewed by Rod:
Great product
Reviewed by Rodger:
Love the product. Vehicle runs cooler and sounds quieter.
Reviewed by Bruce:
Awesome product
Reviewed
by Big B:
Ams is the best oil I have used totally sold on the product
Reviewed by Steven:
fill it out for me
Reviewed by D:
Fantastic product. I use it in my Ridgeline. I opened the oil cap just to look around, the inside of the engine looked new even with over 100,000 miles. Never uses a drop.
Reviewed by Bud:
I own a Range rover sport 08 and started getting timing chain noise for a second or 2 after start up after switching to Amsoil the noise went away and my oil is much cleaner now.
Reviewed by Mckenney:
I used your oil more than 15 years, now my car run like BRAND NEW (My car Is Honda Accord 2008). Thank you.
Reviewed by Apex guy:
Great product, my engines look great when I open them up! I run amsoil in two turbocharged cars and a streetbike. Track days, canyon roads, daily driving, it's great for it all!
Reviewed by Whitetundra18:
I have been using Amsoil products for over 20 years.
They have never let me down and I truly believe they save me money in the long run.
Reviewed by Ace:
Been using for last 5 years. Stopped my old engine from knocking, and went from using oil to not using when I switched to Amsoil.
Reviewed by Joe:
Very good product, I use on all my oli changes.
Reviewed by Persistent:
As long as Amsoil continues to win the comparison tests against the competition, I will continue to purchase this product. The pressure is on Amsoil!
Reviewed by Matt:
2017 Taco TRD offroad 4x4.
I have just over 2500 miles on this oil now and have seen real MPG gains, granted very slight ( just over 1 MPG gain). My truck definitely runs better too.
Reviewed by huffy:
I have a 2010 minivan that used 1/2
qt. per 1000 mil. after using
5w-20 signature series motor oil it now uses none "this is the good stuff!"
Canada
United States
Using Amsoil for 39 years
Been using Amsoil since 1980.