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.
Car Problem Reports
Chevrolet Lumina Intake Manifold Gaskets May Leak Coolant or Engine Oil
Chevrolet Lumina Problem
Engines Affected: 3.1L V6, 3.4L V6, 3.8L V6
Average Mileage: 158,726 mi (79,200 mi - 230,000 mi)
my oil is mixing with the antifrezze.
Visitor, 1998 Chevrolet Lumina, 3.8L V6, 175,000 mi
Engine oil getting into coolant. Mechanic diagnosed as intake gasket. Recommends replacing upper & lower gaskets.
Visitor, 2001 Chevrolet Lumina, 3.1L V6, 120,000 mi
Oil is leaking into coolant. I noticed coolant was milky, diagnosed as intake gasket leak :(
Visitor, 1997 Chevrolet Lumina, 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.
Visitor, 1998 Chevrolet Lumina, 3.1L V6, 140,100 mi
Coolant leak due to deteriorating seals. Repair is $1050.00
common gripe.you can reseal the intake but the repair wont last more than 5000 miles.poor design by gm.
Visitor, 1996 Chevrolet Lumina, 3.1L V6, 170,000 mi
Internal coolant leak and external oil leak. Changing gaskets fixed it.
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.
Visitor, 1995 Chevrolet Lumina, 3.1L V6, 170,000 mi
replace intake manifold gaskets