Customer Ratings & Reviews

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

I used the recommended Rotella T6 forever, can’t get it at a decent price so I tried this and may just be the cold weather but I swear my engine is running cooler. On the highway (not towing) my oil temp would stay around 210-212, but it won’t get above 200 now unless I’m going up an incline or something. Super happy and feel comfortable with Amsoil in my Jeep!!

I’ve had three died pickups and this is the only oil I have ever used. Great performance and engine care with this oil.

have been using amsoil max duty oil in my cummins/dodge for some time 180.000.miles nd going strong

Always felt Amsoil is the best and never ever had oil issues with my vehicles while using Amsoil.

I run this oil in all my equipment and vehicles! Super Great product!

Great products. Always timely delivery. Don't use any other oil in my truck.

I have been running amsoil on and off over the years and different vehicles. I just recently bought a brand new eco diesel ram and thought this is my chance to put it though a true test... right from oil change numero unto. So far it seems to be doing good after 40,000 miles and 4 changes of oil. Will update as I get more miles