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

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: 128,195 (90,000–232,854)
Engine affected: 3.1L V6
3 model years affected: 1997, 1998, 1999
17 people reported this problem
10 people shared problem details
Coolant leak from intake. Cost $1100. Replace intake gaskets water pump with thermostat.Replaced belts and spark plugs.Coolant level on need $135 for resevior and sensor Well worth it.
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Lower intake mainfold leaking coolant and water pump $1075 repair plus diag. Included replacing upper and lower intake /valve cover gaskets/ water / thermostat and flush system.
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Same happen to me.Coolant leaking from lower intake gasket. A guy working from house replaced with aftermarket($895)and started to leak in weeks. Then had redone with factory gasket(Do water pump and thermostat or will leak next and Save$$$ on labor)at mobile service shop.($1125)Runs Great and no more Leaks. Well Worth genuine parts.
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intake manifold leak
1 person likes thisFlag inappropiate
Coolant leak at intake manifold gasket. Quoted $750 to fix.
Noticed that I was losing coolant. First thought the heater core was leaking, replaced that and still had the leak. Then realized it was the intake manifold gasket on the drivers side, after allowing it to leak for awhile I broke down and fixed it. Shop said it would be $1,200-$1,500 to fix. I did it myself, parts total about $100 and it took a total of about 13 hours. VERY involved job but it can be done. No more leaks.
I've had the intake manifold gasket leak twice in the life of the car. I have the car in for a tune up and the mechanic is suggesting I have it changed.
1999 Oldsmobile Cutlass- 3.1L V6232,854
i had both lower intake gaskets replaced and 6 months later i noticed a slight oil leak on both driver side and passenger side of the engine around the manifold edges. no internal coolant leak and oil is still clean with no coolant to oil mixture
same prob. as above. i will replace
bout 800 bucks to fix
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