Quote:
Originally Posted by Railcarmover
Interesting..my experience with viscosity modifiers comes with higher soot numbers during analysis,acid build up and a subsequent drop in viscosity signaled breakdown..oil looked like black water..not arguing your findings,its entirely possible to fail 'up' the chain..my history is almost 100% diesel.
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My take on this is that Diesels burn so little fuel at idle that the cylinder walls are cool enough that some fuel 'condenses' instead of vaporizing so it doesn't all burn and some gets past the rings into the crankcase, thus diluting the oil resulting in lower viscosity. Gasoline engines, on the other hand, will evaporate any gas out of the oil since gas vaporizes at a much lower temperature than diesel fuel.