What are the symptoms that are caused when a PCV valve gets clogged? Is it common to see oil leakage when the car is being driven?

Symptoms of a clogged PCV valve

Tester January 2, 2010, 5:38pm 2

Yes. If the PCV system is plugged it allows crankcase pressure to build inside the engine. This pressure seeks an alternative source of release and with it oil can be pushed out of the engine.

Tester