Mechanics

OIL PRESSURE LOSS, COOLANT BURN-OFF & EN

2004 GMC Yukon

Engine problem
2004 GMC Yukon V8 All Wheel Drive Automatic 101000 miles

My Yukon has been losing some oil pressure about 800 miles after an oil change. Concurrently, I have had to start refilling the coolant reservoir tank frequently. There is no sign of a coolant leak. Engine also has developed a loud knock at startup, 30 seconds later it is gone. The knocking is worse as oil pressure decreases which occurs as time passes from oil change. When checking or adding oil I have also notice some white residue on the oil fill cap. Definately feel like coolant is getting into oil. What could this be?
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Bewhof
January 24, 2008.



Get the oil presssure checked to rule out the oil pump -also for the white residue could mean blown headgasket/cracked head and block get it pressure tested.

Rasmataz
Jan 24, 2008.