What Does It Mean When Oil Is On All Of The Spark Plugs On One Bank Of Cylinders

I have for the oil-electrode part of my spark plugs (the part that is actually inside the cylinder) and all connectors on one bank of cylinders affected, whereas the others are in order. I suspect my already valve cover gasket has an external leak, but I think the problem with the plugs could be something to do with the cylinder head gasket have. Odds are not worn rings, because the plugs are on the other side perfectly, while the plug on the affected bank are all equal wet. My coolant overflow tank reservoir contains absolutely clean, pristine coolant, which is promising but not confirm, nothing. I have already bought a full set gasket for the valve cover, but I wonder whether I should go further and replace the head gasket while I’m at it. Would you like to receive oil from the interior of the cylinder, if the part of the valve cover gasket that surrounds the spark plug is bad? I know it’s a piece, and perhaps it was a blowout of the species. Is there a way to tell before I start cracking open the engine? Compression test? I really hope it’s just the valve cover gasket, but I will go and pick up a head gasket if that is what seems to be the problem. Come to think of you, it may, on the upper half of the dowels were also oil. I have no problems with coolant, however, had suffered from loss of oil. I seem to have convinced me that there is a bad valve cover gasket, so please confirm either this term or inform me otherwise. Thank you! Ok, wow, thanked all those previously written. Lots of good information from everyone. What I am now is to believe that some oil had collected over the threads of the plug, while the electrodes free of oil, that is, until I unscrewed the plugs, the oil allowed to run out the threads and coat the electrodes. This seems sensible that I have the problem by installing the gasket set that I had to resolve. Can anyone confirm this?

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