Customer Ratings & Reviews

I was running another big name brand (T6) synthetic oil before, after switching to AMS oil I can here a difference in how the motor idles. Much smoother and quieter than before

Not much to say other then best oil on the market. I don’t use anything else. I use this in my 2001 Chevy Duramax that is always towing. 10/10 recommend

GREAT PRODUCT BEEN USING FOR YEARS WITH NO ISSUES, CUSTOMER SERVICE ALSO RECEPTIVE TO REQUESTS. I FEEL LIKE I KNOW THEM PERSONALLY

I drive my diesel approx 4000 plus miles a week. Amsoil is without a doubt the best full synthetic oil and 2nd to none

I've used this oil for years on my truck Duramax diesel 315,000 And the motors never been opened it's all I have to say

This oil I have been using ever since I got involved Amsoil I can’t tell you what the inside of the motor looks like because I’ve never had her taken one apart I had a Ford truck for the diesel Dodge Cummings now running it on 2014 Jeep Cherokee Limited and I never have had a problem with it I live in Iowa right now it’s 13 below zero and a cranks over like summer time.

So I’ve bought high end oils before like certified Labs and lubrication engineers Amsoil has surpassed those “competitors” I put this in quotations cause they truly don’t compare.

This is my summer go to oil

Couldn't be happier with the prompt arrival of my oil and filter and on the estimated time of arrival as well. My cummins is running like a clock with the 5w20 signature diesel oil only 1000 miles into the very first service with the filter and oil so I'm looking forward to the next 100,000 miles with it. I do want to add for your awareness that when it opened all three gallon oil jugs, each seal had popped open when I went to pour them in the pickup. I know that once it leaves your facility you have zero control over the "care" either UPS or FEDEX football teams provide the products. Be it elevation changes, being gallon jugs versus quart jugs applying more pressure inside if dropped or squished or what have you, I just wanted to pass it forward. Love the products thus far and look forward to continued use as well as use of some other products in the future

My 2013 Duramax loves this oil

Best products on the market. A vehicle is an investment. Why not treat it like one? Use amsoil.

I've been using this product for 20 years, when I've seen the inside of other engines I use Amsoil in, I see the lack of wear. It must be doing the same thing inside my Cummins Diesel.

I bought it to run in a new diesel engine. I will run it hard and keep reviewing as I use it more and more.

I really enjoy this product. I can change my oil once a year or at 25,000 miles. In the long run this product saves me money.

270,000 miles, still going strong