I found some oil in my spark plug tubes, but I know its not the grommets. I did the head gaskets about 10k ago and replaced them while I was at it. Could it be coming from the spark plugs themselves? They're new also, and I torqued them to spec, but there isn't oil anywhere other than the plug tubes so I don't know where else it could be coming from. If that is it how could that happen? How big of a problem is it?