Should’ve done this before if i love my truck! This is the best choice for my Kenworth T660, runs super nice, and no more garbage oil, or cheap oil on that expensive engine. Recommend 1000%
Bottom Line
Yes, I would recommend this to a friend.
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5 star rating
Endurance
By 
KEVIN, 
a 
Verified Buyer 
from 
Us East Coast  
on 
March 03, 2024
I’ve been using AMSOIL 15W-40 exclusively in my Westerbeke genset and Cummins 6BT5.9 for 18 years now. At every fluid change the analysis from Blackstone comes back with excellent results. AMSOIL is my engine fluids supplier…period!
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