Intake Manifold Gasket May Leak Coolant or Engine Oil on Chevrolet Silverado 1500

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.

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Average mileage: 152,333 (143,000–160,000)
Engines affected: 4.3L V6, 5.3L V8
3 model years affected: 1999, 2000, 2004
6 people reported this problem
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problem details
1999 Chevrolet Silverado 1500 - 4.3L V6 154,000 mi,
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