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 Vandura 2500
Average mileage: 98,500 (97,000–100,000)
Engines affected: 5.7L V8, Gasoline
10 people reported this problem
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coolant and oil mixing and blowing out tail pipe removed all spark plugs they are dry
Only leaks when cold. Leak stops when engine is warm. Not repaired yet.
Collant leak at intake manifold.