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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.
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!
Bottom Line
Yes, I would recommend this to a friend.
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5 star rating
Signature Series Max-Duty Synthetic Diesel Oil 15W-40
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.
Bottom Line
Yes, I would recommend this to a friend.
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5 star rating
Signature series diesel oil
By 
WILLIAM, 
a 
Verified Buyer 
on 
April 04, 2022
I run this oil in my Silverado duramax I have.
I like the better protection this oil provides.
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
Bottom Line
Yes, I would recommend this to a friend.
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5 star rating
Use the best
By 
ROY, 
a 
Verified Buyer 
from 
Maine  
on 
March 28, 2022
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.
Bottom Line
Yes, I would recommend this to a friend.
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5 star rating
Immediately lessened engine noise. Ran smoother as well.
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.
Bottom Line
Yes, I would recommend this to a friend.
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5 star rating
Even though it’s more expensive then most it’s a great oil
Great oil for my 2004 Cummins with 200,000 miles keeps the engine running smooth
Bottom Line
Yes, I would recommend this to a friend.
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5 star rating
2020- 6.7 Cummins 3'rd Service
By 
GARNET, 
a 
Verified Buyer 
from 
So Cal 
on 
March 14, 2022
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
Bottom Line
Yes, I would recommend this to a friend.
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5 star rating
Firs time
By 
DANIEL, 
a 
Verified Buyer 
from 
Maiden Nc  
on 
March 13, 2022
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
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