Quote:
Originally Posted by Aleks
PCV just moves air from the bottom to the top of the crankcase, preventing it from getting trapped in the sump or in places it shouldn't, and that air obviously does have atomized oil in it as well.
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PCV system prevents pressure from building up in the crankcase, which occurs because of leakage past piston rings. It doesn't simply move air around. A clogged PCV valve in severe cases will cause oil to be forced past seals even damaged them or blowing them out completely.