Intake Manifold Gasket May Leak Coolant or Engine Oil on Pontiac Montana

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: 134,000 (60,000–298,000)
Engines affected: 3.4L V6, 3.5L V6
7 model years affected: 1999, 2000, 2001, 2002, more2003, 2004, 2005
36 people reported this problem
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problem details
2001 Pontiac Montana 298,000 mi,
MY MONTANA IS STILL LEAKING AND MIXING WITH THE OIL ENGINE. IT'S OVER HEATING AND STOP AT ALL TIMES. AFTER 3KMs,IT'S WARM UP VERY HIGH. I LIVE IN OTTAWA, CANA AND I NEED A GARAGE TO FIX IT FOR. IS IT A RECALL FROM THE MANUFACTURE?
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
2003 Pontiac Montana - 3.4L V6 62,000 mi,
Smell of hot antifreeze, coolant disapearing
2005 Pontiac Montana - 3.5L V6 111,000 mi,
Coolant is leaking from the lower intake gasket onto the ground.
I have water mixing with the oil but no leaking on the ground
2002 Pontiac Montana - 3.4L V6 75,000 mi,
Intake manifold gasket leaking coolant, had to replace gasket twice!!!!!
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.
2002 Pontiac Montana - 3.4L V6 60,000 mi,
Coolant leak at intake manifold gasket. Replaced at GM dealer with new design gasket.
2002 Pontiac Montana - 3.4L V6 140,000 mi,
intake leaking coolant
antifreeze leaking from intake manifold gasket
2000 Pontiac Montana 143,000 mi,
But this is not the first time we've had to replace the intake manifold gasket.
intake manifold gasget leaking
Had antifreeze and oil missed together had a technician fix it
2002 Pontiac Montana - 3.4L V6 102,000 mi,
leaking oil/transmission fluid. replace intake gasket $950.00