Intake Manifold Gasket May Leak Coolant or Engine Oil on Buick Regal

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.

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Average mileage: 108,448 (84,000–180,690)
Engines affected: 3.1L V6, 3.8L V6, 3.8L V6 Supercharged
7 model years affected: 1994, 1995, 1996, 1997, more1998, 2001, 2002
10 people reported this problem
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Viewing 1 - 3 of 3 problem details
2002 Buick Regal - 3.8L V6 Supercharged 84,000 mi,
Intake leaking a little oil and a lot of coolant. Had to putt intake and replace gasket.
1998 Buick Regal - 3.8L V6 180,690 mi,
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.
2002 Buick Regal - 3.8L V6 90,000 mi,
Oil in radiator; antifreeze in oil.