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 Chevrolet Silverado 1500
Average mileage: 152,333 (143,000–160,000)
Engines affected: 4.3L V6, 5.3L V8
6 people reported this problem
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Loosing 1 qt of coolant approximately every 1000 miles. No evidence of leaks. Oil looked okay, no evidence of coolant in oil. Removed and replaced intake manifold gasket. Coolant loss stopped.
slight loss of coolent have been told intake vale leakage ,aloss of half cup every 2 weeks