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: 154,340 (12,600–635,000)
Engines affected: 3.1L V6, 3.4L V6, 3.8L V6
8 model years affected: 1994, 1995, 1996, 1997, more1998, 1999, 2000, 2001
49 people reported this problem
20 people shared problem details
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.
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 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?
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.
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.
common can reseal the intake but the repair wont last more than 5000 miles.poor design by gm.
2000 Chevrolet Lumina- 3.1L V6140,000
Lower intake gasket failure.
2001 Chevrolet Lumina- 3.1L V6120,000
Oil is leaking into coolant. I noticed coolant was milky, diagnosed as intake gasket leak :(
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.
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.
2001 Chevrolet Lumina- 3.1L V691,000
The head gasket is allowing coolant and engine oil to mix.
1997 Chevrolet Lumina- 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!!
1996 Chevrolet Lumina- 3.1L V6
oil leaking into coolant fluid
1997 Chevrolet Lumina- 3.1L V6127,467
coolant leaking out of gaskets
I was told by my mechanic that my lower intake manifold had a leak and that it will cost $600-650 to fix it. This is the biggest problem I have had so far which is pretty devistating to my pocket at the moment.
1995 Chevrolet Lumina- 3.1L V6170,000
replace intake manifold gaskets
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