Car Problem Reports

Chevrolet Lumina Intake Manifold Gaskets May Leak Coolant or Engine Oil

Chevrolet Lumina Problem
37 Reports
Me Too

Model Years Affected: 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001

Engines Affected: 3.1L V6, 3.4L V6, 3.8L V6

Average Mileage: 145,632 mi (45,000 mi - 230,000 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.

  • jeromejr., , 3.1L V6, 150,000 mi

    my oil is mixing with the antifrezze.

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  • Visitor, , 3.1L V6, 140,100 mi

    Coolant leak due to deteriorating seals. Repair is $1050.00

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  • Visitor, , 3.8L V6, 175,000 mi

    Engine oil getting into coolant. Mechanic diagnosed as intake gasket. Recommends replacing upper & lower gaskets.

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  • Visitor, , 3.1L V6, 151,900 mi

    I have been smelling a rather "hot" coolant and oil like smell for a short time and temp gauge would rise time to time in standstill traffic. I always kept my fluids level, and could not determine what it was at just the fluid checking step. I recently had trouble starting the car. I thought it was the battery, but was starter. Starter failed because of oil/coolant leak onto parts below; the buildup caused starter to malfunction. Coolant in reservoir very murky and oily.

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  • Visitor, , 3.1L V6, 230,000 mi

    Coolant is leaking, so I replace the water pump,it needed it anyway, to see if that was the problem. It still continues to leak underneath the serp. belt pulley. So I think it might be the intake manifold gasket. That sucks.

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  •  Master

    common can reseal the intake but the repair wont last more than 5000 miles.poor design by gm.

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  • Visitor, , 3.1L V6, 170,000 mi

    Internal coolant leak and external oil leak. Changing gaskets fixed it.

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  • Visitor, , 3.1L V6, 120,000 mi

    Oil is leaking into coolant. I noticed coolant was milky, diagnosed as intake gasket leak :(

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  • Visitor, , 3.1L V6

    Intake manifold gasket. I bought the car used from someone in the family. Fortunately I bought the car for $600. I wasn't aware that the gasket for this car is (according to my mechanic) plastic. When I bought the car someone was a jack*** and put the wrong coolant in the car which already caused enough trouble but apparently also ate right through my gasket! :( I don't understand why they made a part that goes inside of an engine that gets decently hot out of plastic!!

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  • Visitor, , 3.1L V6

    oil leaking into coolant fluid

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