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.
Intake Manifold Gasket May Leak Coolant or Engine Oil on Pontiac Firebird
Average mileage: 135,255 (87,000–243,900)
Engines affected: 3.8L V6, 5.7L V8, V6, V8
15 people reported this problem
Viewing 1 - 6 of 6 problem details
Almost everyone I know with the GM 3.8 has had this intake manifold gasket fail. I dont know why there are only 7 reports here. There is a mechanic in Portland that does nothing but these repairs all day long for used car dealers
Oil in the radiator.
cost me about $375 to get it fixed.
Intake leaking oil. Dripped on distributor so I had to replace it as well. Lasted 20 years so not bad
Engine oil mixed, in radiator fluid
I have a manifold leak