Customer Ratings & Reviews

I change my oil once a year his oil allows me up to 25,000 miles before I have to change.

I run Ams oil in my truck, SUV and motor cycle .It costs a little more but to me it's worth the extra cost.. I tend to push my oil changes a little longer so I just use what I think is the best.

I use this product in my pick up that has a Duramax and it with 187,000 miles

Amsoil is a very good oil for my echo diesel dodge truck. I have used Ams for years and I am sold on the product.

We have used amsoil on our farm and if it holds up there it can hold up to any thing! I won't use any thing but amsoil products in every thing I own!

I have nine diesels on the ranch and use Max-Duty in all of them including a few gasoline engines. Works like I expect it to work.

great product

if you want the best protection for your engine buy amsoil. I use it in everything so my equipment will last.

Use this in my 12v Cummins was adding about a half a quart of oil every 1000 miles before switching to to this oil now it's about a half a quart every 4000 miles and I change it every 5k.

Hands down the best oil out there i have tested my oil after it comes out and still have amazing tbn numbers in ty he 5 range with 7000 miles on that oil

When I ordered my duramax in 08 I wanted to run the best oil and fluids because I don't plan on buying another 65,000 truck. I researched extensively and found the decision easy. Everything but the radiator has amsol. I'm at 320,000 problem free miles. With the exception of the headlights that regularly burn out, I haven't had one single issue with my truck. I bought a 24' triton boat with a 300 yamaha and the day my warranty ran out it also got refilled with amsol marine oil. .

Was introduced to this oil and it really works. Protecting my 6.0 Diesel Engine under any load, especially with the Bypass oil system!

The total Base number is way too low for my liking since they changed the formulation. I am switching brands of oil.

I like the way it keeps my engine clean and running free.

I have been using Amsoil since 2009.

I have tried every kind of synthetic for a diesel engine and found AMSOIL to be the best by far. I have a E350 Ford van with a 7.3 power stroke engine. I have gained two miles per gallon and the motor runs smooth.

First 10K was great, pushing this last oil change to 25K will update review after my oil analysis is done.

I use this product in my Ford F250 6.0L PSD. I noticed my turbo spooling up easier and quicker after switching from conventional oil. The 6.0L PSD's are very tough on the oil due to the high shearing of the oil pressure run fuel system and the lubrication of a hot turbo. Many professionals highly recommend changing at 6000 miles in the 6.0 PSD. I run my diesel kind of hard with pulling a lot of heavy loads and running a hot tune for daily driving and playing around, my last oil change was at 9000 miles. Oil was still full without adding any, still feels more slippery than new conventional. I reuse it in old oil burning engines and it cuts the oil consumption in half. A relative of mine has been using my drained Amsoil in their beater car for over a year and it cut way down on the oil consumption. I would run the oil longer in my 6.0, but like to recycle it into the older engines. I use only the Amsoil long life oil filter. I may purchase the oil test kit in the future just to see if there is any depletion in the strength of the oil, but I am very happy with my use of this product.

So glad I've switched to Amsoil products! I want nothing but the best going in to my engines. Outlasts any lubricant I've ever used in my vehicles.

Amsoil synthetic keeps my work truck running and me making money. The only way to go.