I've heard good stuff about it from a bud of mine that wrenches on Cummins' for a living.

I run Castrol in my SD with a Heingst (sp?) erl filter. I believe a quality filter has a lot more to do with the life of the motor than simply oil. Sticking to a quality oil and you should be fine. Valvoline, Castrol, or Shell are all great dino oils.

I run 15W40... I dunno if running 20W50 would be better.

__________________
I'm not a doctor, but I'll have a look.

'85 300SD 245k
'87 300SDL 251k
'90 300SEL 326k

Six others from BMW, GM, and Ford.

Liberty will not descend to a people; a people must raise themselves to liberty.[/IMG]