By 
Avalon , 
a 
Verified Buyer 
from 
Us East Coast  
on 
November 16, 2024
AMSOIL 15W40 has been the only oil used in my 1999 Cummins 6BT5.9 along with their filters. EVERY oil analysis from Blackstone has come back with zero negatives. I will always use AMSOIL products in my engines.
Have ordered several times , each time order processed quickly and ships Immediately. Products always come well packaged. I have used Amsoil for 15 years in my Duramax and recommend it.
Bottom Line
Yes, I would recommend this to a friend.
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5 star rating
A quality product that I use time and time again
By 
MICHAEL, 
a 
Verified Buyer 
from 
New york 
on 
May 30, 2024
I’ve used a few different types of oil in my 07 ram 2500 5.9 turbo diesel and this is by far my first choice every time
Bottom Line
Yes, I would recommend this to a friend.
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5 star rating
Best diesel oil
By 
JUSTIN, 
a 
Verified Buyer 
on 
May 19, 2024
Best diesel oil you can get for the price from Amsoil. Ii usually only go 5000 miles in a year so I push the change intervals past recommended but it still is very good condition. Will only use this oil
The ordering process was great and I have made my first trip pulling my 5th wheel.
It seems to help my engin temperature was a couple of degrees cooler. I look forward to more traveling.
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