Intake Manifold Gasket May Leak Coolant or Engine Oil on Oldsmobile Silhouette

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: 127,145 (56,000–235,000)
Engine affected: 3.4L V6
9 model years affected: 1996, 1997, 1998, 1999, more2000, 2001, 2002, 2003, 2004
36 people reported this problem
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Viewing 1 - 13 of 13 problem details
2003 Oldsmobile Silhouette 100,000 mi,
Had to have the intake manifold gasket replaced exactly 2 years ago at 81K miles at a cost of $1500 and now it has failed again. This part should last to at least 120K by most accounts and now I'm looking at replacing again.
2000 Oldsmobile Silhouette - 3.4L V6 122,656 mi,
Intake manifold gasket developed coolant leak Replaced gasket. This same problem developed at 59,000 miles and was corrected exactly the same way. This was corrected on both occasions very early upon noticing the odor of coolant. The engine has always been serviced with Mobil 1 synthetic oil and that may have help prevent any internal damage.
2002 Oldsmobile Silhouette - 3.4L V6 125,000 mi,
manifold gaskets are crap
1999 Oldsmobile Silhouette 201,400 mi,
Engine started leaking water. Tracked it down to under intake manifold. Now i am going to fix it.
2001 Oldsmobile Silhouette - 3.4L V6 60,000 mi,
shop did it for $850 ... Lot of labor.
My can keep heating up
1998 Oldsmobile Silhouette 94,000 mi,
At 94, 000 miles replaced transmission, 96,000 replaced motor when camshaft broke, oh also replaced head gasket at 93, 000 now at 161,000 head gasket is leaking again. Headlights alway full of water, in winter bulb would shatter in cold weather. Had to drill small hole in bottom of light to let the water drain. Driver side window needs new motor every few years. seat controll broke off , never worked well.
1996 Oldsmobile Silhouette 120,000 mi,
Head gaskets failed. Replacement was required. $2000
2002 Oldsmobile Silhouette - 3.4L V6 150,000 mi,
You can smell the coolant in the cab faintly for a couple minutes after starting. Had to replace intake manifold gaskets but only cost me $500 with a coolant flush
1999 Oldsmobile Silhouette - 3.4L V6 125,000 mi,
running hot,got rad. flush. run good 5 mins., coolant all on ground
1996 Oldsmobile Silhouette 85,000 mi,
Manifold leaks oil a quart a month
2002 Oldsmobile Silhouette - 3.4L V6 111,000 mi,
Intake manifold gasket leak very expense repair gm knows and never issued a recall
2003 Oldsmobile Silhouette - 3.4L V6 56,000 mi,
I took my car in to Gregg Young Chevrolet for new tires they did an engine check and said that all the gaskets and seals needed to be replaced. We had them replaced for over $1000. 2 weeks later car died and I am now told I need a new engine. They are telling me that damage had already been done to the engine prior to my replacing the gaskets and seals. Why did they not check to be sure there wasn't damage done before charging me for gaskets and seals?