Customer Ratings & Reviews

Quick delivery of great product for awesome price when all others are going crazy on price.

I believe that you should only use one oil for the life of your engine. Since my 2017 gmc Denali 2500 was new My first oil change I started using asm oil I never had warranty repair made on my truck. I am a ase master tech for Cadillac and shop foremen I’ve got my service write To start to using asm oil in his ats v And I use in my ats v too They are the only oil company that has spec On there oil and numerous hours for test I’m a believer yes it maybe a little more money but worth it and if Gale Banks Believe in ams oil that seals the deal with me :).

Been using amzoil for almost 15 years in my powerstroke and my cummins. Won't use anything else.

My family has used the product in 6.2 Durmax for years.

I’m really happy with the synthetic oil quality for my Duramax.

Great product Amsoil is the only oil that I have used for 18 years.

Changed from Rotella T6 to this Amsoil Signature Series. My truck seems to love it!! Seems to be running quieter and nice and smooth. Did my friends truck and the same time with the same results. Both very happy at this point!!

I use my RAM 2500 cummins for towing up and down the Sierra Nevada in the heat of southern California and in the cold of the mountain. This is the only oil i trust in my engine with all the punishment it takes. Ordering directly from amsoil is fast and easy. I do all my own services so it makes financial sense to spend the money on quality oil and filter. I only needed customer service once and they were very helpful.

Best oil 🛢 I got a x15 cummins run 40000 miles on oil change oil is still good

I have been using signature series max since 2007 in my diesel trucks. No one engine issue. I highly recommend it!

Stumbled across this product a couple years back while searching for a diesel oil that met the new Ford certification for the 6.7L. At the time, it was all the local parts shop had. Been running it ever since! Engine seems to run smoother and can barley be heard running down the highway. So thats enough for me to keep using and reccomending.

Truck with 355,000 miles, runs like new!

runs quieter will use again this coming fall

I've used Amsoil in two different GM Duramax trucks and love this oil. I switch as soon as I get the vehicles and wouldn't use anything else. Great product!!!

I started as a dealer in 2009 i have sold and recommended to many I have used Amsoil in many vehicles and equipment got started due to needing a quality oil for my diesel truck and have used it ever since I strongly believe it’s the best it has never failed running cooler in high heat and towing has been it’s strong point I’m no longer a dealer it’s not for everyone because you’ve got to sell a lot but 12 years and still going strong Amsoil is the best and now so many have jumped on the synthetic train but Amsoil has remained on the top in my book.

2015 RAM 1500 ecodiesel. GDE Tuned from the first second the motor was started. Used the factory recommended Rotella T6 until the engine warranty was done (new motor). As soon as I put in this beauty of an oil, my oil temps dropped 2-3 degrees. Normal everyday driving. Highway commuting. I watch my temps all the time, and it was an instant drop in temp. Love this stuff.

Have been using Amsoil products for 40+ years have found nothing better, great products perform as advertised. Great

Good product I recomended

The best oil I ever had, my Cummins ISX15 runs great with drain at 50k miles, I would say Is no oil consumption with only this oil! My engine has 900k miles! BEST, thanks AMS Oil for great product!!!

best oil I used in my diesel