today I change the spark plugs,gas filter,oil presure switch and I also change one of the motor mount but I have to take the back to get replace. well my question is should I change the PCV valve and what would be te gain from doing that!, right now my car is riding good just need to change the last motor mount.

 

The pcv should be replaced as part of the tune up you did. I recommend checking and cleaning/replacing it every 15K. Replacing it every 30K. It vents crankcase gasses back into the intake. If it clogs, the combustion gasses build up in the crankcase resulting in premature deterioration of engine oil and possible sludge build up inside the engine.

 

i mean why not. i dont know what it does, but i broke the line when i did this, just had to go out and get another one was like a buck.

 

It is good much longer than that. I mean at leasat 60K

SuDZ

 

I wouldn't let mine go 60K without checking/replacing it. Just my .02

 

I think that is how long Nissan tells you it is good for in the FSM.

SuDZ