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by mailmanpilot on July 9th, 2006

mailmanpilot

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My 1991 Mercury Grand Marquis 5.0 has oil in the air filter compartment. What could be wrong?

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Answers. 2 helpful answers below.

  • by gopiqpp on November 5th, 2008

    gopiqpp

    Probably worn rings but Check the PCV Valve too. If it is blocked you get high crankcase pressures and oil in the air filter. 10 minutes and 10 bucks to fix.

    http://www.carpartswholesale.com/parts/mercury/grand_marquis/pcv_valve.html

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  • by Darryl61 on July 9th, 2006

    Darryl61

    It is probably coming from the breather hose. It sounds like you have a blow-by problem, a pressurization of the crankcase which is caused by worn rings in the engine, not uncommon for this old of a car. There is little to be done, short of an engine rebuild. If the car is still running to your satisfaction, simply clean the filter housing and change filter a little more often.

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