Car Problem Reports

GMC 3500 Pickup Intake Manifold Gaskets May Leak Coolant or Engine Oil

GMC 3500 Pickup Problem
14 Reports
Me Too

Model Years Affected: 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000

Engines Affected: 5.7L V8, Gasoline

Average Mileage: 140,853 mi (102,560 mi - 202,000 mi)


The intake manifold gasket may develop and external engine oil or coolant leak. In some cases, an internal coolant leak may occur causing coolant to mix with the engine oil. Running the engine with a coolant/oil mix may result in engine damage. Replacing the intake manifold gasket should correct this issue.

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