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. Our technicians tell us that operating the engine with a coolant/oil mix can result in internal engine damage. Replacing the intake manifold gasket should correct these leaks.
Intake Manifold Gasket May Leak Coolant or Engine Oil on Buick Regal
Average mileage: 108,448 (84,000–180,690)
Engines affected: 3.1L V6, 3.8L V6, 3.8L V6 Supercharged
10 people reported this problem
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Intake leaking a little oil and a lot of coolant. Had to putt intake and replace gasket.
Check engine light came on and started flashing. Car ran rough. When shut off, wouldn't restart. Intake manifold gasket leak. Antifreeze in oil. Would have had to replace the intake manifold gasket, plenum, spark plugs, flush antifreeze system and change oil. Decided not to fix it, sent it to salvage yard.
Oil in radiator; antifreeze in oil.