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.
Car Problem Reports
Pontiac Montana Intake Manifold Gaskets May Leak Coolant or Engine Oil
Pontiac Montana Problem
Engines Affected: 3.4L V6, 3.5L V6
Average Mileage: 125,357 mi (60,000 mi - 225,000 mi)
Visitor, 2005 Pontiac Montana, 3.5L V6, 111,000 mi
Coolant is leaking from the lower intake gasket onto the ground.
Visitor, 1999 Pontiac Montana, 3.4L V6
I have water mixing with the oil but no leaking on the ground
Visitor, 2003 Pontiac Montana, 3.4L V6, 62,000 mi
Smell of hot antifreeze, coolant disapearing
Visitor, 2002 Pontiac Montana, 3.4L V6, 75,000 mi
Intake manifold gasket leaking coolant, had to replace gasket twice!!!!!
Coolant leak at intake manifold gasket. Replaced at GM dealer with new design gasket.
Visitor, 2004 Pontiac Montana, 130,000 mi
My oil stick showed very high level of oil in it. The color is off so it has to be leaking anti-freeze into the engine.
Visitor, 2003 Pontiac Montana, 98,000 mi
Started leaking oil two weeks after a oil change. Took it to one shop they said nothing was wrong. Took it to another and for sure three hours later they found out it was an intake manifold. Are these things common
Visitor, 2003 Pontiac Montana, 3.4L V6
Had antifreeze and oil missed together had a technician fix it
Visitor, 2002 Pontiac Montana, 3.4L V6, 140,000 mi
intake leaking coolant
leaking oil/transmission fluid. replace intake gasket $950.00