i got oil on my spark plug from cylinder number 3.. im assuming i have no compressiion on it ethier cuz the engine rockz like crazy wen itz running.. any idea on wat the problem is most likely?? blown head gaskeT? ad ringz? thankz

 

rings

 

how much oil are we talking about? it sounds like it's the rings, if the plug is not completely covered with oil, a thicker oil could help. but then again if it's acting up like you say it is it might be too late for that.