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.Google+
Car Problem Reports
Chevrolet Express 2500 Intake Manifold Gaskets May Leak Coolant or Engine Oil
Chevrolet Express 2500 Problem
Engines Affected: 5.0L V8, 5.7L V8, Gasoline
Average Mileage: 93,000 mi (68,000 mi - 103,000 mi)
Visitor, 2002 Chevrolet Express 2500, 5.0L V8, 68,000 mi
Smelled Antifreeze and had it checked out to find the Intake Manifold was leaking Estimate Cost $940.00 and I am on SS. THANKS GM
Visitor, 2000 Chevrolet Express 2500, 5.7L V8, 103,000 mi
Intake manifold gasket leaks. Bolts, after time, were not torqued properly. Tightening didn't help.
Visitor, 2001 Chevrolet Express 2500, 5.0L V8, 101,000 mi
Antifreeze leaking from the top of the engine on the passenger side, intake manifold gasket was worn out, replaced and changed oil.
Visitor, 1997 Chevrolet Express 2500
Engine was misfiring real bad sprayed starting fluid around intake and could hear the difference,replaced gasket