Car Problem Reports

Buick Century Intake Manifold Gaskets May Leak Coolant or Engine Oil

Buick Century Problem
135 Reports
Me Too

Model Years Affected: 1991, 1992, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005

Engines Affected: 2.2L 4 Cylinder, 3.1L V6, 3.3L V6

Average Mileage: 100,268 mi (30,000 mi - 277,684 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.

  • , , 3.1L V6, 85,000 mi

    Experiencing the exact same, known issues with my Buick Century 2001 as mentioned in the Dex Cool lawsuit of 2008: Unfortunately, I was not aware of that lawsuit or I certainly would have filed a claim to cover the cost of repairing a failed Intake Manifold gasket and seals. My car's radiator has a brown sludge in it, which has contributed to a leak as well as corruption of the coolant sensor and the overflow bottle.

    I called GM Customer Relations and after their District Manager Katarina from Seattle region promised to assist after GM told me to get the problem diagnosed at a local Buick Dealer, I was then handed off to a Rasheed in Customer Relations, who said Katarina had conveniently gone on a vacation for a week. Rasheed now told me GM won't pay for the repairs.

    SHAME on General Motors! This was a KNOWN problem (cheap, plastic materials used for their Intake Manifold Gaskets and a bad reaction between DexCool and the radiator) since 1996, according to embarrassing internal GM documents. And yet, GM still won't pay for my repairs.

    My extended family has been a long-time GM customer, purchasing Cadillacs, Buicks and GMC trucks in the past from them. Do you think we will EVER buy another GM product after such unethical, disrespectful treatment???

    Not only should they pay for their obvious and court-documented MANUFACTURER DEFECT because it is the legal and ethical thing to do, they need to show respect to us as American taxpayers whose hard-earned money BAILED GM out of their bankruptcy in 2009.

    SHAME on you., General Motors. shame!

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  • , , 3.1L V6, 60,000 mi

    Replacing manifold gasket 1,000 dollars. Replacing entire engine in a car with only 60,000 miles when it died 60 days later 2,000 dollars. Buying a buick again? No way.

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  • , , 107,000 mi

    Intake Gasket replacement

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  • , , 3.1L V6, 132,000 mi

    oil in antifreez

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  • , , 3.1L V6, 75,000 mi

    its not fixed. There is no way I can afford $1000 to fix the darn thing and I sure as heck cant afford to buy another car. Thanks GMC ! GMC should have to some how right this wrong. I NEED MY CAR !

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  • , , 277,684 mi


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  • , , 3.1L V6, 110,000 mi

    just got from older couple 2 month ago it has coolant leak and all so oil nothing to serious yet i keep stuff checked runs real good

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  • , , 3.1L V6, 78,000 mi

    Going to have intake problem repaired along with new antifreeze. Price quoted $550--six hours labor.

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  •  Rookie

    Collant leaking at rear of block between intake manifold and top of block between the lower part of the heads... slow at first then enough to trip the low coolant light... can't wait much longer to repair.

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  • , , 3.1L V6, 72,000 mi

    leaking oil into the radiator

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