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Running royal purple, using K/N"prechargers" over dual spectre cones, and the Bosch filter , my oil would be darker at change time(every 3-4000),or change time would be shortened(I'll change it early if its gettin ugly) then after switching to K/N. If I'm just sucking cabin air, it does last longer, but does still darken considerably-which I attribute to temp as my foot is heavy, and our humidity is a m/f. I'll drop some onto paper towels(the oil spreads out and the solids make a "target").No obvious metal after the first 2-3 changes, that would change I'm sure if went longer between changes. Now I'll ask a possibly stupid question,is there any benefit to running some clean oil(2 quarts) through the engine(start, stop redrain),prior to changing out the filter and refilling w/oil? This was suggested to me by a friend out west
who does it regularly as part of "his war on dust/sludge"....I may be wasting time , but dam# if doesn't pick up more trash. The spot test reveals smaller "targets" by half, but still a lot of solids obviously in suspension.
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