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Actually, I think the upper lube oil (2-stroke or MMO) gets into the crankcase during the power stroke. These oils are advertised as "ashless" which implies that when they burn, they leave no [significant?] residue/ *Nowhere* does it say that it *all *burns. On a pusher it will get all over the prop. On a tractor it may leave you with an oily belly. As most of it burns (ashlessly :o) some of it blows by into the crankcase sump, the rest goes over the side.
Or so it seems to me ... Jim S.
Bob Perkinson wrote:
The fuel vapors are blown overboard and only minute traces of oil are left behind. Multiply it by few million repetitions and you end up with extra oil. That’s my theory?
Bulent
Bulent,
If that’s the case then, for every oz. of oil in the sump there was a gallon of fuel that went overboard in vapors with a mixture of 1to128.
Bob Perkinson
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