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 Yukon Denali
Average mileage: 170,000 (170,000–170,000)
Engine affected: Gasoline
3 people reported this problem
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Denali started overheating and was losing antifreeze. Diagnosed and fixed by local mechanic but replacing "defective" intake manifold gaskets.