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. Running the engine with a coolant/oil mix may result in engine damage. Replacing the intake manifold gasket should correct this issue.
Car Problem Reports
Oldsmobile Achieva Intake Manifold Gaskets May Leak Coolant or Engine Oil
Oldsmobile Achieva Problem
Engine Affected: 3.1L V6
Visitor, 1996 Oldsmobile Achieva, 3.1L V6, 94,126 mi
Just got back from the shop. Estimated repair of $725 is more then the car is worth.