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 Chevrolet Impala
Average mileage: 87,750 (66,000–120,000)
Engines affected: 3.4L V6, 3.8L V6
9 people reported this problem
2004 Chevrolet Impala - 3.8L V6 88,000 mi, Visitor
overheating while idle; cool down while driving;
2004 Chevrolet Impala - 3.8L V6