oil for cummins 8.3
I have a Monaco diplomat with a cummins 8.3L I was told to use Rotella 15-40 W Can I use Rotella 5-40w synthtic
Forum Discussion
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.
