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....
Best to use the recommended oil. Long gone are the days of 30 or 20w50. And don't get all excited about changing every 3,000 miles. Book probably says 5,000 and I recommend 10,000. Do keep it topped off.