Bought a 2006 Dodge with 5.9 Cummins with 92,0000 miles. Performance was very good at time of purchase. After 2 tanks of fuel using AMSOIL Injector cleaner and Cetane boost, performance increased. Injectors must have had a degree of contamination blocking the nozzles. Much better now.
By 
CHRISTOPHER W, 
a 
Verified Buyer 
from 
Idaho 
on 
April 20, 2021
Been using this for better than a decade. My ‘97 powerstroke runs better on Amsoil than on any other oil I’ve tried. Idles better, has more power and just overall performance is up when I use it. No lie,
By 
MATTHEW, 
a 
Verified Buyer 
on 
March 31, 2021
Sent an oil sample in after 15k miles and oil was still performing great
Bottom Line
Yes, I would recommend this to a friend.
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5 star rating
Great oil for commercial truck
By 
The boss man, 
a 
Verified Buyer 
from 
California 
on 
March 31, 2021
was having issues with my oil pressure was told I needed a new engine $17k yikes but I was using what ever oil the shop was putting in it so since I've had great results with amsoil on other vehicles I decided to give it try its now been 22k miles and engine is running great I've been using it with an oil stabilizer and no more pressure issues or burning oil. the best part is according to the shop it would last 2mo its been 1-1/2yrs and going strong so yes I recommend this to anyone looking for best diesel oil
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