Well I again have a problem I am trying to get the bottom of with my wifes SC. When we first got the car it had a mild case of what we thought was valve clatter. It happened at idle and under load. Now It has gotten louder. I have tried 5w-30 and 10w-30 oil and even ran seafoam. I took it to the dealer and was told by two different mechanics that since the vehicle is supercharged they'd reccomend 20w-50 race quality oil. Apparently this is the type of oil that Ford Racing and Eaton recommend for supercharged applications. Suggestions? Also does anyone know if these cars require valve adjustments or not? I only ask because I had an 86 Mustang that had the 3.8 and apparently had self adjusting valves.