What Oil do you use in your cummins?

[DBottles]

Conoco power d 15/40. Change every 10,000 miles. Can eat out of my engine. Its that clean.

 

[granduer]

AMSOIL all the way, ran Rotella before and oil analysis is now much better.

 

[Regcabguy]

Longevity.

Put anything you want in them. Fact is they'll outlive most of us.

 

[DonFitzwater]

My truck is privy to anything I buy... ... . Super tech, Cummins premium blue, Rotella, Pennzoil, Mopar, and the other half of the year it's running Delo 0-w40 full synthetic. Dang it runs better in the winter on that watery stuff! :-laf

 

[07 ThunderRoad]

Valvoline Premium Blue for 21,000mi then switched to Valvoline Premium Blue Extreme (5w40 synthetic).