comp test would be good, there shouldn't be enough oil slinging around in the valves for it to fill the spark plug sockets, they get alot of oil but unless theres alot of blow by it isn't pressurized, it would about have to come through the plug hole(to piston side) but if youv'e got that much oil in the comb. chamber you've got bigger problems, how tight (ft lbs) are your plugs and or are any of them stripped ?