I have a 2001 Xterra with the 2.4 engine. I replaced my PCV a few years ago. The new PCV has been on there for around 2 years. I am now seeing my oil dipstick popping out about an inch. I am guessing from over pressure in the engine. Today I noticed oil mist spraying from the rear of the valve cover oil seal. I replaced this valve cover gasket 2 years ago . Could the PCV have gone bad this fast to have caused this over pressure and oil leaking ? I have had many cars and trucks never need a new PCV. Are there any other hoses associated with the PCV that I may not can see that may be clogged ? Any information is appreciated.