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pcv not working.check see if pcv valve getting vacuum at the intake if not look for broke or disconnected vacuum hose to pcv.if pcv valve working with engine running should feel vacuum suction at pcv if not pcv faulty.if pcv okay other possible causes for oil in the air filter.worn oil rings or too much oil in crankcase.
One at front usually goes to the air cleaner box...rear one is for pcv valve, but if cover was installed backwards they may be reversed. Pcv hole usually has a baffle inside to keep it from sucking oil into the airstream.
Hi, Jeep offers a free download of owners manuals for '04 and newer vehicles. For older models, you can purchase a manual. Log onto this Jeep site to order one. Let me know if you have any trouble finding the manual. Good luck! http://www.jeep.com/en/owners/manuals/index.html