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Old 01-31-2013, 10:48 PM   #14 (permalink)
Runs with scissors
Join Date: Jan 2013
Location: Illinois
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Spot - '05 Scion XA
90 day: 30.33 mpg (US)
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Originally Posted by wmjinman View Post
One question I have is why the oil seems to get black so soon. Could it have been from the out of tolerance valve guides, or does it mean soot & crud are getting past the rings? Or could it mean something else?
Worn out valve guides will cause oil contamination. If there is no indication of excessive bore wear, the fresh head by itself may slow the discoloration down.

I'm with Old mechanic 100% on doing a ring job properly. A car can become a money pit pretty quick by doing stop gap repairs.
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