All, Well, I've done it now. I brought home a new class A. Mine is on the FORD F53 chassis. The oil fill cap & owners manual state it is to use 5W20 motor oil ? WOW! That sure is thin....
I use MC 5-30 syn blend the most important # is 5 as when you start need oil moving instantly. been told by lots of people 20 or 30 dosen't matter, i use 30 a far as living in Sfla(more heat)