Car Problem Reports

Pontiac Montana Intake Manifold Gaskets May Leak Coolant or Engine Oil

Pontiac Montana Problem
32 Reports
Me Too

Model Years Affected: 1999, 2000, 2001, 2002, 2003, 2004, 2005

Engines Affected: 3.4L V6, 3.5L V6

Average Mileage: 134,000 mi (60,000 mi - 298,000 mi)


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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