oil for cummins 8.3

I have been using Rotella synthic in my Cummins 5.9L for the last 150,000 miles and have had zero issues. I change it twice a year.

Read carefully Bob is the oil guy, motor oil university 101-201 and then decide what works for you.

Richard

In all my 50yrs trucking, I never ever seen cummins engine use anything but 15-40 oil and the oil I use is Delo 400 15-40, I think if you call and ask cummins they will tell you the same all though some guys are trying to use a synthetic oil today. Just my thoughts.

absolutely and your eng will thank you & repay you with better cold starts and long life.

Yes.