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 would go with the guys on the internet that have far more miles on their engines. like I said Ford decided the 5W30 wasn`t right for my V-10 and said to use 5W20. many people by the time they said it was OK to switch had well over 100k mi on their motors with the 5W30.