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.
Was this review helpful?
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 
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.
We used to run Amsoil in oil fleet vehicles years ago, don’t know why they got away from it.
Anyways, I run a 2019 Chevy DRW, bought it with 92k. First oil change I did, went with Amsoil Signature. Went to oil change interval recommended by GM (approx 7k miles). I tow a 14-16k 5th wheel light/ moderate distances several times a year. Had the oil tested by a 3rd party, analysis came back I could go to 10k. Levels tested still well above normal for oil with the mileage and oil filter was still good. Don’t know how they could test that, but they did.
Went 10k miles on next interval, had it tested again, same tests, same company. Analysis came back less than before, but still above acceptable levels according to them.
Have a sample from 15k miles waiting to be tested.
I can say, all of my vehicles now use Amsoil signature!
This exact oil saved a motor that blew a head gasket and lost all but 2 of the 14 quarts.
Ford mechanic was amazed at how good the cylinders still looked. He stated he had many that had the same problems but all the others the motor was trash. Mine just had to have a new head gasket engine flush fresh oil and antifreeze. Then was back on the road.
Thank you for visiting www.amsoil.com. Certain parts of this website may not function with Internet Explorer. To continue shopping with us, please update your browser using one of the options below.