Quote:
quote:Originally posted by Sheepdog
I use Rotella T6 5w-40 Full Synthetic, get it at Walmart for 21.99/gal.
When I had my 2004 Cummins, I remember them not recommending full synthetic for the first 10k miles, so the engine could properly break in. Don't know about the new ones, but you might want to check.
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X2 On the Rotella. The truck tells me when to change and it usually is around 7500 miles.