Problem overview
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.
8 people reported this problem
3 commentsMercury Grand Marquis vehicles with this problem
Average mileage: 90,000 miles
(80,000 - 100,000)
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