Cylinder misfire -- wet spark plug. Valve cover replace?

nknight

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Arden Hills
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MN
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2014 XC90 3.2 AWD
#1
Hi -

I've had a persistent misfire issue on cylinder 6 (PO306). Now it looks like I'm getting misfires on cylinders 4 and 5, as well as the random misfire code (P0300). When I pulled the spark plug last night, there was some oil on the threads. Does that mean that the valve cover or spark plug o-ring is leaking? Is that hard to replace (do I have to remove the timing belt cover as well?). Or would it be something else?

Thanks!
 
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