I use Amsoil in my cars and motorcycles and just tried in my semi truck. Can’t believe the difference over other major brands. I was disappointed major brands because I do long oil intervals changed with my ops filter and oil test every 25000 miles. The major brands I couldn’t keep the base up to where it needed to be. I will update on my lab test on Amsoil after 25k . Plus my fuel mileage went up one tenth. We will see if this continues
By 
MIKE, 
a 
Verified Buyer 
on 
August 30, 2023
Surprised, a lot smother and quitter engine
Bottom Line
Yes, I would recommend this to a friend.
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5 star rating
Using this oil for many years
By 
MAHRAD, 
a 
Verified Buyer 
from 
Central Florida 
on 
August 27, 2023
I have been using the 15 W 40 Amsoil diesel oil for many years on different GMC Duramax diesels. All on lower mileage trucks. It is a good durable oil. No burning of loss of oil. No engine mechanical issues. I perform the oil changes myself. Libricity of the old oil is very good. The 2.5 gallon container is difficult to handle without spilling. I recommend getting it in quart size containers. I recommend the oil.
By 
JOHN PAUL, 
a 
Verified Buyer 
on 
August 24, 2023
This product is spectacular, immediately noticed improved performance in my truck and I would not use any other brand besides amsoil for diesel engines!
Bottom Line
Yes, I would recommend this to a friend.
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4 star rating
The trip
By 
KK, 
a 
Verified Buyer 
from 
Plymouth wi to masa AZ  
on 
August 20, 2023
I use 5W-40in my 3VW TDI WHEN I TOOK a trip to AZ 122 temp I seen my oil in my Commons diesel pick up to literally evaporate the oil. In Wisconsin, my truck doesn't use any oil. In outer Arizona, it evaporates the oil.
This is the only oil that I have found that does not cause me problems with my diesel exhaust filter. No regens since I have been running it. Ram 1500 ecodiesel.
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