i pulled the plugs on my 200 six to oil the cylinders for the winter. When I pulled the plugs the threads were soaked in oil and it looked like the oil was coming from the valve cover. there was also oil on the head bolts on the exhaust side. I had replaced the valve cover gasket and also put a sealant on the gasket last year. The valve cover is a chrome aftermarket that was on the car when I bought it. could this cover perhaps not be stiff enough to give a proper seal. Another thing is how would the oil go past the plug seal? Could the oil perhaps not be returning to the pan fast enough and filling up the valve cover. the head was rebuilt and when I put it back on I poured the oil in with the valve cover off and it seemed to go down quickly. Any suggestions would be appreciated.