Reviewed the test results and I am satisfied the oil suits my needs. I do some heavy hauling and have used the oil since the truck was new. No issues.

Love amsoil the only oil I run in my diesel truck

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

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