Intake Manifold Gasket May Leak Coolant or Engine Oil on GMC 3500 Pickup

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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Average mileage: 140,853 (102,560–202,000)
Engines affected: 5.7L V8, Gasoline
11 model years affected: 1990, 1991, 1992, 1993, more1994, 1995, 1996, 1997, 1998, 1999, 2000
14 people reported this problem
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problem details
1994 GMC 3500 Pickup - 5.7L V8 202,000 mi,
Coolant leaking from engine block
1998 GMC 3500 Pickup - Gasoline 102,560 mi,
intake gasket leaking
1998 GMC 3500 Pickup - 5.7L V8 118,000 mi,
leaking coolant from intake manifold