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

Problem Description and Possible Solution

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.

Problem Data
RepairPal Verified
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
Viewing 1 - 15 of 15 problem details
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?
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
I have water mixing with the oil but no leaking on the ground
Smell of hot antifreeze, coolant disapearing
Coolant is leaking from the lower intake gasket onto the ground.
Intake manifold gasket leaking coolant, had to replace gasket twice!!!!!
Coolant leak at intake manifold gasket. Replaced at GM dealer with new design gasket.
intake leaking coolant
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.
antifreeze leaking from intake manifold gasket
But this is not the first time we've had to replace the intake manifold gasket.
Had antifreeze and oil missed together had a technician fix it
intake manifold gasget leaking
leaking oil/transmission fluid. replace intake gasket $950.00