I have a deposit down on a 1997 Itasca Class A 32'motorhome with a 460 Ford V8. Currently I have a 1990 E350 27' Class C, also with the 460 V8.
Here is the interesting part: The E350's 460 calls for 5w30 or 10w30 PCMO, but the Class A's 460 calls for 5w30 or 15w40 HDMO (specifically says rated CF4).
So I am both excited and dissapointed at the same time. I am excited that I can run Valvoline Premium Blue 15w40 in it, but I am dissapointed because my 160 quart oil stash has absolutely no HDMO.
Ah well, I probably can just beef up the PCMO with SLOB or some other additive.
As for the big difference in oil spec, I can say the Class C is 9500 lb dry weight, whereas the Class A is 13000 lb dry and has a larger load capacity than the Class C.
The Class C's 460 runs 65 psi hot on 10w30, so I could not imagine running 15w40, but maybe the Class A's 460 is built different. Perhaps the oil pump is different. It will definitely work harder with the extra lbs.
Here is the interesting part: The E350's 460 calls for 5w30 or 10w30 PCMO, but the Class A's 460 calls for 5w30 or 15w40 HDMO (specifically says rated CF4).
So I am both excited and dissapointed at the same time. I am excited that I can run Valvoline Premium Blue 15w40 in it, but I am dissapointed because my 160 quart oil stash has absolutely no HDMO.
Ah well, I probably can just beef up the PCMO with SLOB or some other additive.
As for the big difference in oil spec, I can say the Class C is 9500 lb dry weight, whereas the Class A is 13000 lb dry and has a larger load capacity than the Class C.
The Class C's 460 runs 65 psi hot on 10w30, so I could not imagine running 15w40, but maybe the Class A's 460 is built different. Perhaps the oil pump is different. It will definitely work harder with the extra lbs.