i have a 1991 mercury grand marquis and i am in the process of restoring it. i have had one oil leak already out one of the valve cover gaskets that i got fixed and it cost me around 200 dollars. now i have another leak on the drivers side of the car but i am unable to find it. i also can hear a dripping sound when i turn my car off in the area that the leak is. i can also see fresh oil in some places around the area but i cannot find the source please help.