oil in spark plug reservoir on 2003 Nissan 350Z

When I changed my spark plugs I had oil in the plug holes. Will changing the valve cover gaskets fix this? Could this damage the coils?

Asked by for the 2003 Nissan 350Z
Did you find out where the oil leak was coming from? Was it the valve cover gasket?
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i have the same problem oil in the valve cover tubes how do you fix this a new valve cover is 275.00 this is crazy I have a 2004 touring con