Grand Marquis

Intake Manifold/Valve Cover Gaskets May Leak Oil on Mercury Grand Marquis

Problem Description and Possible Solution

It is not uncommon for the intake manifold and/or valve cover gaskets to develop a coolant or oil leak. Leakage from the intake manifold may result in coolant in the engine oil. Coolant mixing with the engine oil severally impacts the lubrication ability of the oil. Internal engine may result if this condition is not repaired promptly.

Problem Data
RepairPal Verified
Average mileage: 80,000 (80,000–80,000)
3 model years affected: 1990, 1991, 2000
5 people reported this problem
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Oil leak into coils causing misfire with spark plugs