What would cause this
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2003 Hyundai Elantra Question: crank shaft seal dislodged and leaking oil
Answer #1patrick mannion from Greg Solow's Engine Room, October 07, 2009, 13:30Master
Excess crankcase pressure due to a restricted PCV valve could cause this or a kinked or restricted PCV hose. if the engine crank "breath" it will develop pressure internally and cause several engine oil leaks. Could the seal just got hard and brittle due to age?