2003 Mazda 6 Engine oil consumption

2003 MAZDA 6
67,000 MILES • 4 CYL • 2WD • AUTOMATIC
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RELLIK502
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The engine of my car runs good before I tried to use the "full synthetic oil". The engine starts to leak but no obvious oil drops or stains either at the bottom of the car or the ground. I firstly guess the reason might be oil burning but later found no smokes at all. Afterwards, I saw the coolant level drops lower than the minimal and I also found that the color of coolant became brown.
Are those the sign of bad head gasket? I don't want spend so much $$$$$ on a used car even though it has only 67k miles on it. What should I do?
Jan 3, 2010 at 3:22 PM
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ERICZ1
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Check the PCV valve, which seems to be a common problem with oil loss.
Jul 8, 2010 at 9:48 PM