modern oils don't have the zinc in the formulation that the old engines liked. the zinc / ZDDP was removed in the 1970s because oil+zinc getting past the rings into the combustion chamber results in tailpipe contaminants that clogs up those stupid catalytic convertors.
therefore, i usually use a modern diesel oil ( which still has zinc in it ) like Rotella 15w-40. i wouldn't go "thinner", thinner oil is really only good in a modern engine with really tight tolerances.
additional benefit is that diesel dino oil is pretty cheap, given that even small diesels will usually take a gallon and a half or more per change.
don't skimp on the filter though. NO FRAMS. get yourself an AC Delco, Wix or Napa Gold.
The way to crush the bourgeoisie is to grind them between the millstones of taxation and inflation.
Vladimir Lenin
Government schooling is about "the perfect organization of the hive."
H.H. Goddard, Human Efficiency (1920)
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