The PCV valve lets oil be sucked back into the intake and burns it. The fix for that is a replacement valve cover with a baffle inside. The dealership SHOULD know what that's all about, but... 
One guy I heard from said he bought a cheap clear plastic fuel filter and just plain plumbed that into the PCV hose between the valve cover and intake, it catches a lot of the blowby without hindering the PCV system's function.
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Owner of NPORA, mod for Nissan-Infiniti Forums, NissanForums.com, NissanHelp.com, AllNissans.com and VGPowered Forums
'88 Pathfinder: 6" of lift, 33x13.50 Swamper LTB's, Rancho 9000's, L&P Stage 3 steering system, K&N, Pacesetter headers and 2.5" exhaust, Lock-Right locker, 110A alty and electric fan swap, dual batteries, 700W+ worth of PIAAs, etc.
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