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Old Sun, Sep-19-2010, 10:13:41 PM   #2
Maginnovision
Got stock love?
 
Join Date: Oct 2008
Age: 33
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Location: San Fernando Valley

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There are many reasons a cylinder could be low. If you're doing a valve job you'll be able to check every possibility. Valve job should include pressure testing the head and decking it. You'll be able to see if the gasket decided to blow as well, which will have to be replaced anyway. Just because coolant and oil aren't mixing doesn't rule anything out. The mixing of the two is an indication something is wrong, not mixing doesn't mean there isn't a problem. If it is a bottom end problem you should be able to see that as well. I'd say go ahead with the valve job, and you should be able to figure out what's wrong. If nothing else, the shop SHOULD have done a leakdown test after the compression test. If they didn't, or didn't suggest it, don't go back there.
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