Car Problem Reports

Oldsmobile Silhouette Intake Manifold Gaskets May Leak Coolant or Engine Oil

Oldsmobile Silhouette Problem
30 Reports
Me Too

Model Years Affected: 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004

Engine Affected: 3.4L V6

Average Mileage: 122,332 mi (56,000 mi - 180,000 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.

  • Visitor, , 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.

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  • Visitor, , 120,000 mi

    Head gaskets failed. Replacement was required. $2000

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  • Visitor, , 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

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  • mocha50, , 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.

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  • Visitor, , 3.4L V6, 125,000 mi

    running hot,got rad. flush. run good 5 mins., coolant all on ground

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  • Visitor, , 85,000 mi

    Manifold leaks oil a quart a month

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  • Visitor, , 3.4L V6, 111,000 mi

    Intake manifold gasket leak very expense repair gm knows and never issued a recall

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  • Visitor, , 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?

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  • Visitor, , 3.4L V6, 125,000 mi

    manifold gaskets are crap

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