Car Problem Reports

Buick LeSabre Intake Manifold Gaskets Can Develop Engine Oil Leaks

Buick LeSabre Problem
70 Reports
Me Too

Model Years Affected: 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005

Average Mileage: 101,717 mi (27,000 mi - 200,000 mi)


The intake manifold gasket can develop external engine oil leaks. The intake manifold will need to be removed and the gaskets replaced to correct this issue.

  • Visitor, , 114,000 mi

    I reported to the nearest dealer (Chevy, not Buick) that the driver side intake manifold melted in one spot and appeared to be caused by a coolant leak. Looked like coolant was dripping onto part of gasket extending outward of engine. Ten hours later (called dealer at 5:45 p.m.(cost for diagnosis is $79)told that replacement is needed for both plastic elbow tubes with o rings (tension assembly piece and motor coolant flow tubes), two intake manifold gaskets, a transmission gasket, and replace both rear shocks is estimated at $1500 (nothing in writing yet).

    I am a little uneasy in letting this be done as I had to have a major transmission repair right after this dealer did a transmission flush (do not recommend at all) and I found transmission fluid all over the engine compartment and the engine a few days later.

    Fix it. I plan to ask the service manager if they can do better and reduce the cost from $1500. If not, I will delete the rear shocks (do them myself at a local auto craft shop) and tranny gasket (no visible leaks anywhere)and see what the revised cost estimate numbers are.

    Just for some fun, one phone call to a parts place produced the following: plastic elbows are $3.99 a pair; non-plastic gasket intake manifold kit is $299.00. And, the current on engine intake manifolds are make out of plastic....and I am totally surprised to hear that and am not keen on that at all. Now, intake manifold gaskets can develop engine leaks. Assuming these gaskets are the plastic ones that were not advertised to this owner by GM.

    My budget is $1,000 but not $1500 with all the stuff added in. I would like to buy some X-mas presents, too, for children/families who are poor and not making it in this economy...etc.

    I paid $36,000 for this vehicle (new) and these problems at 114,000 miles on a maintained vehicle makes me wonder why buy American or GM or I should trade in every five years. Trade it in seems to be the answer for me.

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  • Visitor, , 107,300 mi

    The intake manifold gasket leaks engine oil. Replaced manifold gasket to correct.

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  • Visitor, , 57,315 mi

    Engine oil leak. Replaced the upper intake plenum gasket per GM recommendation to fix problem.

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  • i have replaced the plenum twice. the original plastic plenum was replaced with another plastic plenum from my friendly buick dealer by an independent mechanic. the second time around, about 2-3 years later, i bought a more durable plenum from a discount auto parts company, and it's still going. this "planned obsolescence" by GM really "upsets" me, but i'm not buying foreign ... YET!

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  • Visitor, , 200,000 mi

    external oil leak and also internal- entering in the cooling system as evidenced in the resivoir.

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  • Visitor, , 133,000 mi

    loss of coolant, oil leaks, upper plenum to throttle body deterioration. installation of lower intake gaskets, upper plenum replacement at the same time.

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  • Visitor, , 92,000 mi

    Had to replace intake manifold gasket with external leak just as gasket was breaking down which i was told by the mechanic would allow fluids to begin to leak internally. I was on a long trip and had it repaired at dealer without further incident.

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  • Visitor, , 74,000 mi

    leak anti freeze I read that anti freeze GM used was part of the problem dex-cool they lost a class action lawsuit I was taken to the weeds by the dealer for repair cost over $1200.00 had the same problem with a 1997 buick la sabre alimited and a 1998 lasabre they each went bad around 90000 cost me $850 each time they also were rust prone spent $4000 to replace rocker panels this is common for a Buick.

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  •  Rookie

    It took me 800 bucks to get the problem fixed.

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  • Visitor, , 97,000 mi

    Manifold plastic melted and the seals leaked had them replaced at pet boys $800.00 Also had a 1998 Buick intake manifold and seals replaced 87,000 miles cost less than $800
    Also last year purchased a 2001 Buick Lasabbre with only 70,000 miles on it from Luther Chev Buick they checked it out Luther a few days after buying it for $8000 for a 13 yr old car check engine light cane on took it back to luther they checked it out said it was a small vacum leak not worth fixing a few weeks later had to add anti freeze a few times suspected manifold leak had it checked by Luther it was a leak the gave me a estimate of around $800 was pissed just bought the car demanded they had lied to me on the last inspection they also said tierods were bad Was BS they were trying to stiff me. Then they said they would
    give me a low cost for repair, which they than charged me $1248 for the gaskets no manifold altho he looked in the book and still doubled the estimate than said he gave me a good deal it took them over 8 hrs a monkey could do it in two Am considering legal action. Luther sucks

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