Intake Manifold Gasket May Leak Coolant or Engine Oil on Chevrolet Lumina

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: 140,489 (12,600–230,000)
Engines affected: 3.1L V6, 3.4L V6, 3.8L V6
8 model years affected: 1994, 1995, 1996, 1997, more1998, 1999, 2000, 2001
55 people reported this problem
26 people shared problem details
1998 Chevrolet Lumina- 3.1L V6
Car is leaking coolant and is now leaking oil but not mixing. Car has not been running hot. Haven't smelled that coolant smell. Could it still be the intake gaskets?
1998 Chevrolet Lumina- 3.1L V6151,900
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.
my oil is mixing with the antifrezze.
1997 Chevrolet Lumina- 3.1L V6230,000
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.
I checked my oil and it was a weird color and was rather high on the dipstick, i noticed a faint smell of gas.My daughters boyfriend says i have gas in my oil. I just got my oil changed about 2 months ago and do not drive alot of miles.
1998 Chevrolet Lumina- 3.8L V6175,000
Engine oil getting into coolant. Mechanic diagnosed as intake gasket. Recommends replacing upper & lower gaskets.
1998 Chevrolet Lumina- 3.1L V6140,100
Coolant leak due to deteriorating seals. Repair is $1050.00
1996 Chevrolet Lumina- 3.1L V6170,000
Internal coolant leak and external oil leak. Changing gaskets fixed it.
2000 Chevrolet Lumina- 3.1L V6140,000
Lower intake gasket failure.
common can reseal the intake but the repair wont last more than 5000 miles.poor design by gm.
2001 Chevrolet Lumina- 3.1L V6120,000
Oil is leaking into coolant. I noticed coolant was milky, diagnosed as intake gasket leak :(
1999 Chevrolet Lumina- 3.1L V6109,000
coolant leakin from somewhere .
1998 Chevrolet Lumina- 3.1L V6179,802
I was driving Sunday morning and I noticed the temp gauge going up. Pull to the gas station no problems. Leaving the gas station I started seeing smoke so i pulled over couldn't see where the problem was went back to the gas station put coolant in took off everything seemed ok . half way home started seeing smoke temp went up been parked every since.
1994 Chevrolet Lumina- 3.1L V6180,000
Coolant leak from the intake manifold gasket.
1997 Chevrolet Lumina- 3.1L V6
Lower manifold intake
1996 Chevrolet Lumina- 3.4L V6
Water in oil mixture
1999 Chevrolet Lumina- 3.1L V6144,434
Well it couldn't be fixed cuz my motor blew
2000 Chevrolet Lumina- 3.1L V6179,000
There is gas in my oil
1998 Chevrolet Lumina- 3.1L V642,649
Haven't fixed it yet, did a block test, no combustion gases in the radiator. No external exhaust steam, and the only symptoms are coolant in the crankcase and loss of coolant. Changing the intake manifold gasket and oil and oil filter and re-check!
2000 Chevrolet Lumina- 3.1L V6120,000
Engine oil was appearing in antifreeze. Mechanic said that intake manifold gasket needed replaced. $900.
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