I'd figure the biodiesel should be very well washed, if there's any lime left in it, just that and ethanol in the fuel, when there's excess fuel getting past the rings, will do the diesel plant transesterification thing in the crank case with the mineral oil under heat and pressure. Synthetic is already transesterified so should survive it, might use up some of the additives early though. Well prepared biodiesel, you should be able to add a quart in the crankcase and not get any ill effects... unless you count mobilising years of sludge build up and cleaning it out as an ill effect, which is also possibly what happened here.
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I remember The RoadWarrior..To understand who he was, you have to go back to another time..the world was powered by the black fuel & the desert sprouted great cities..Gone now, swept away..two mighty warrior tribes went to war & touched off a blaze which engulfed them all. Without fuel, they were nothing..thundering machines sputtered & stopped..Only those mobile enough to scavenge, brutal enough to pillage would survive. The gangs took over the highways, ready to wage war for a tank of juice
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