Oil Spotting on Valve Cover

Bill W

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After a short drive I have oil spotting on top of the valve cover under the MAP sensor. It's been a year now and it never gets worse than the photo shows. I've tightened the valve covers. I can't see oil leaking any other place under the hood. Any ideas where this is coming from?
 

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robi68

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Mine also occasionally has a halo at that point, but no leaks, I think it's vapors.
 
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