Customer Ratings & Reviews

Highly recommend!

Best oil out there, especially for extreme conditions

It’s great oil. Just did my last oil change and I think it will be the last. As it is already expensive and they increase the price , and made me pay for shipping. That was the last purchase.

I love the Diesel oil, as I love Amsoil period, very high quality oil, I use their oils in all my trucks, tractors, zero turn, and side x side.

great oil

Have been using this signature series for a great number years in a 2004.5 Cummins haven’t had any issues

great oil

I believe this oil has kept my engine from have bearing issues as is it the case in many 3 liter ram truck and jeeps that they put them in. Winter can be a issue with cold starts on diesel engine but with the Amsoil its never an issue here rarely plug in the block heater. Tony Harrington

Good product unfortunately however recent price increase will force me to change brands.

Noticed a difference in the sound of the engine after putting in Amsoil. Runs a lot smoother. Also, shipping was extremely fast!

Amazing engine oil , only oil I will ever used.

The best oil I ever had, extremely low oil consumption on ISX15 engine, runs 50.000miles till drain!

Best products out there highly recommended

Second oil change using amsoil. Old oil looked good after 24k miles. No issues.

I have been using this oil for many years in my diesel pickups. Unequaled protection allows for extended oil change intervals.

Order was processed and shipped very quickly. Have actually noticed my trucks fuel mileage improving and engine running smoother. I gave this a try after running shell rotella t6 for years and won't be looking back. Highly recommend!

Probably the best fully synthetic oil I ever used and purchased. I would continue to purchase. Go Amsoil

Been using since my truck was new. Currently has 94K miles.

Oil last and stands up to the label

I used this oil for two and a half years and 25000 miles in the 6.7 liter Cummins engine in my Winnebago RV. This included a trip through Canada and all of Alaska and back. I changed the oil and sent a sample of it in for analysis. The results came back that the oil was still in perfect condition, and could have been run longer. Now that I have those baseline test results, I will sample it after 20,000 miles of use, and again after every 10000 additional miles. This will allow me to see how long I can run it before it really does need to be changed. So impressive!