So I first started using Amsoil in 1980. I had a 1979 Chevy K20 4x4 with a 4 speed trans. I had changed all lubricants to Amsoil. I remember how impressed I was when pushing in on the clutch in sub zero weather and the truck not feeling like I just hit the brakes. Fast forward to today. I now have a 2015 Duramax and have been using Rotella T6. Due to supply chain issues T6 is getting hard to find in my area so I thought let’s give Amsoil a try again. So after about 3500 miles I have noticed that the Truck is running around 15 to 20 psi higher oil pressure than with T6. Not sure why just an observation.

Been running this oil in my 2004 Chevy LLY Duramax for over 10 years. 218K miles. Still waiting on the EA052 oil filter

I now have my favorite oil! I will never be using any other oil then this amazing product..

Love Amsoil products!! Nothing better in my opinion. I run Amsoil in everything I own!!

I have used this product exclusively in my 2018 duramax. I have done a couple of used oil analysis as well. This oil is great. Wouldn't use anything else. The customer service is great too!

I have great confidence in this oil. I like the idea of extended (25,000 mls) oil change intervals with twice the protection. I find my oil pressure is 3lbs greater when operating at 2000 RPM than with Shell Rotella 15w40 Diesel Oil. Shell Rotella maybe cheaper by the mile, but it has only half the protection.

I run this oil in my Silverado duramax I have. I like the better protection this oil provides.

Order arrived quickly, about two or three days. Just changed the oil everything looks good so far.

Arrived fast, however 1 container was leaking had to transfer to another container. A real mess on my steps

This oil is awesome, it feels completely different from other competitors. I will never again use any other oil in any of my trucks.

I have been using Amsoil for over 10 years great product all around. I have 2001 F350 w/7.3 diesel. 249,000 miles. Still get great gas mileage. Fast shipping

I use Amsoil in all my vehicles. My 2020 Ram 2500 with a 6.7 Cummins Takes 13 qts due to the fact I’m using The Amsoil bypass filter set up. With the rising oil prices i can go twice if not more on an oil change. This stuff is The best.

This is my first time using Amsoil. I have read great reviews so I’m looking forward to long engine life and great performance on my 2021 Ford F 250 6.7 L diesel truck while using this great product with real life and real world testing.

First time using this. Immediate results as far as less noise and smoother running engine!

I finally pulled the trigger and switched to Amsoil. I've been using 15-40 in both my diesel pickups and I'll have a more in depth review once I change my oil again.

Great oil for my 2004 Cummins with 200,000 miles keeps the engine running smooth

Instantly sounding much smoother considering how industrial this engine is as a whole- Much quicker to build oil pressure than the Rotella with 5k on it with an ambient of 7*F- Being in So Cal and having a interesting time finding 5w40 approved engine oil,glad to know you guys have it on the shelf- Have purchased a few 2.5 gallon jugs since-

I have a 25 hp LS tractor that I have used the max duty oil in since new and it’s been great. The tractor seems to run cooler than the factory oil and it gets hot in Kansas during mowing season

For me to be the first time using Amsoil And rate the product I’ll have to see how looks when I do the oil change again then I can said all good or bad things since I never heard of Amsoil before but l am impressive with some of the challenges they had put against other competitors I hope that Amsoil would be my first and forever oil For all my cars

Great oil, let’s my duramax run cooler than rotela oil and stays clean upto 5,000 miles!