Customer Ratings & Reviews

Changed oil at 12000 miles with some heavy towing. Had the oil tested and the results came back excellent, going to change again ant 15000 miles and have tested to see where i go next.

Oil stays clean for a long period, oil analysis tests great! By far my oil of choice!

Best diesel oil

Great oil. So much better then full synthetic and dinosaur oil.

This is the best oil I've used.

The best oil i have ever used and will continue to use in every vehicle i own.

Great Product

The proof is in the results. I tested the Rotella T6 from dodge and had higher than averages in Iron, copper and silicone. With the amsoil all of those are back within spec on the 1st run of amsoil. I ran the amsoil 500 miles longer than the Rotella. My second batch of amsoil is in the engine right now with 2000miles on it.

Good winter oil

Great service with a great product. No better way to protect my L5P !

Keep up the great work

So far so good for the oil. The best oil on the market as I am concerned and especially for my Diesel Heavy Duty F-450. Like the other products purchased as well.

Been using this since the original oil was changed out. When I get the chance to talk of how I feel about what is required to make a Diesel engine to be environmentally compliant, (which I'll hold my opinion). No matter how long or short a conversation is, the one question asked of me is what oil am I running? After answering Amsoil, their response is usually, I'm running the best, or if someone is another brand loyalist, their response is it's one of the leading oils out there! After reading and watching videos on Amsoil, it was a simple choice!

By far the best

On my last oil change, I switched to the 15W-40 Signature series Max-Duty synthetic Diesel oil. I had been running the 15W-40 Heavy duty Diesel and Marine oil since 2008 with excellent results, so when this one came out I figured why not give it a try. So far, the oil has performed exceedingly well. Engine runs cool, smooth and quiet. I own a 2006 Silverado 2500HD LBZ Duramax which is aproaching 400,000 miles and it's still running great. Oil change intervals have averaged between 12000 - 18000 miles for the life of the truck. I still don't even need to add any oil between changes. I run Amsoil lubricants throughout the whole truck.

Been running this oil for 50,xxx miles + and zero issues.

It is the best oil for the price.

I have used Amsoil in all my vehicles for 25+ years now. You simply can not get better oil.

Use amsoil in all three of my vehicles.

I like this oil it is great!