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

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: 119,051 (100,000–135,789)
Engines affected: 3.1L V6, 3.4L V6
5 model years affected: 1993, 1994, 1995, 1996, more1997
10 people reported this problem
5 people shared problem details
1996 Oldsmobile Cutlass Supreme- 3.1L V6100,000
Oil had gotten into the radiator and I began to burn the engine coolant and oil cause the engine to steam/smoke. I flushed the radiator out and refilled it with new engine coolant but now my car is misfiring and idles/takes off very rough.
1997 Oldsmobile Cutlass Supreme- 3.4L V6123,520
Identical issue- overheating, no water in overflow tank, caramel colored oil.
1993 Oldsmobile Cutlass Supreme- 3.1L V6101,000
Overheating. Oil gone from crank case. Found it in radiator.
1995 Oldsmobile Cutlass Supreme- 3.1L V6135,789
Its also a good time to replace head gaskets at the same time. Its only a few more bolts to take off.
1995 Oldsmobile Cutlass Supreme- 3.1L V6119,000
Started overheating quickly withing just 3-5 minutes of driving. Noticed the peanut butter color substance in the oil from the coolant and oil mixing. Lower intake gaskets on the 3.1 are notorious for blowing out, replaced it, problem solved.
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