Hello Landon!
08 Nov 96 19:02, Landon Robinson wrote to Sean Dunbar:
 LR>  The only thing that keeps combustion gases from going straight into the
 LR> oil is the piston rings, and due to the way they are made the best seal
 LR> that they have is during the power stroke.
But all engines are subject to some blow-by. The better the additives 
package, the cleaner the engine will be. Including oil contamination.
 LR> If you have the engine off and the cylendars are full of gas it will
 LR> leak between the ring gap(s) and pollute the oil.
Some raw gas is always present at shutdown.
John
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