200k mile sol

changed my spark plugs today to find out 3 outta the 4 plugs had oil all over the threads. ive been researching about it on here and people are saying vavle cover gasket and spark plug tube seals. but what i dont get is. my exhasut dosent smoke or anything like they talk about. whats wrong

Syndacate

scratch everything I said, I'm beyond confused O.o

I do belive it's the plug tube seals though.