Customer Ratings & Reviews

I'm glad there is a brand I can trust for all my engine needs. Since I'm retired, I don't put much miles on so it's good to know I can go all year on one oil change. Also the OEM filters are trash. 50% or less effiiciency.

I started using synthetic oil when I bought my 2011 Sierra 5.3L and I started with Mobile1 then after awhile switched to RoyalPurple then went all out and bought Amsoil! Jesus this stuff is crazy expensive but you get what you pay for! Ever since I started using Amsoil I don't have to worry about engine failure due to lubrication. My truck has been tuned to 390hp from the factory 325hp. She will turn 6-grand going thru the gears and im confident i have the best of the best lubrication available! Like I said it did hurt paying that much for oil but it's much cheaper than an engine replacement! My oil pressure is higher than it was using other oils. All the reviews I've read about oils and Amsoil came out on top every time! Especially in the heat & viscosity test! Heat had no effect on Amsoil and that right there sold me!

I use this oil all the time in my customers and my small engines. No issues.

Short sweet and to the point, this is the best oil available. I faithfully use Signature in all my vehicles. It keeps the engine clean, and nearly eliminates the wear I am accustomed to seeing in engines using "dino" oil.

Won't use anything else! Totally satisfied!

Its the only oil I will use to protect a 30k Shelby engine. It stays clean, it runs cooler, zero oil consumption

Cooler operating temp, better mileage, longer oil change duration, almost zero oil consumption in 6 months of use.

excellent oil i use on my ford raptor.

So far my truck really seems to like the Signature Series in it. Im happy with the way the truck runs and seems to run smoother and idle a lot better.

Amazingly good oil. Have it in one vehicle since 30,000 miles, and find that when I change it, it is perfect. No level change, and very clean consistent viscosity.

As with all Amsoil products I know I am getting quality products that will protect my vehicles.

As with all Amsoil products I know I am getting quality products that will protect my vehicles.

As with all Amsoil products I know I am getting quality products that will protect my vehicles.

The best oil money can buy! I use it for all of my vehicles. I would not use any other oil in the market. Try it, you’ll like it! You just might switch over from the oil your using now.

I’m using it in my Challenger Hellcat I love it I will always gonna use AMSOIL in all of my cars! I never gonna buy any other kind of oil ever!