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.
Intake Manifold Gasket May Leak Coolant or Engine Oil on GMC Safari
Average mileage: 148,666 (105,000–200,000)
Engine affected: 4.3L V6
10 people reported this problem
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Just happened yesterday. Gasket needs to be replaced
coolant leak for some time and eventually total failure. intake gasket replacement was solution