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2nd Gen Ram Tech1994-2001 Rams: This section is for TECHNICAL discussions only, that involve the 1994 through 2001 Rams. For any non-tech discussions, please direct your attention to the "General discussion/NON-tech" sub sections.
All pistons have a certain degree of blow-by ... that's why you have a PCV system. What they're talking about is the gas/air mixture "blowing by" the rings into the crankcase. Oil can go the other way when the rings have worn the cylinder enough. The oil control ring can no longer scrape the oil off the wall ... resulting in oil bypass into the combustion chamber.