who makes rural king's 15w40 oil? it's way cheaper than even walmart...

[RickB]

More proof that diesels were built to operate at extended periods at full rated rpms and at full power.
Stop/start, putting around, light load and idling ruins a diesel. Fuel is not fully burned, cylinder walls wash down oil gets contaminated and the oil is not hot enough to evaporate the light ends and moisture from the sump.

True, but the engine being discussed here is a gasser.