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2010 GMC Yukon Hybrid – Repeat Engine Oil Leak
CUSTOMER CONCERN The engine has a repeat oil leak, the dipstick is pushed out of its tube, and moisture is present in the fresh-air tube. CAUSE Inspection confirmed a leaking valley-pan gasket and an oil-pressure-sensor leak rather than an isolated rear-main-seal failure. CORRECTION Remove and replace the valley-pan gasket and leaking oil-pressure sensor, clean the crankcase-ventilation passages, and verify the oil leak is eliminated.
2010 Chevrolet Silverado 1500 Hybrid – Repeat Valve-Cover Oil Leak
CUSTOMER CONCERN A valve-cover oil leak returns, the oil dipstick is pushed out of its tube, and moisture is present in the fresh-air tube. CAUSE Inspection confirmed a failed crankcase-ventilation condition was allowing pressure and moisture buildup at the valve cover. CORRECTION Remove and replace the valve cover and install the updated vented oil-fill cap.
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