this cant be goood. i did the valve cover gasket and spark plugs on the passenger side of my 540i. i must say this has been one big pain in the balls. it took me 4 hours just to do one side. so i quit when i just got done and will save the other side for another day. im pretty shocked at how much better the car runs now just from one side. but now i have smoke billoing out oif my exhaust. im guessing this is the oil that got down into the combustion chambers when i was putting plugs in. any other ideas or is my engine on its way out?