while 13K is not a good idea on conventional oil, it's not the worst i've heard. some friends at dealers have seen lease turn-ins with the original oil filter on it still (i guess there's a way to tell? )

02 Mustang GT... Tuned by Nelsons. Low 12's, anyone? .....______ ___|______\_____ |/-\_________/-\_| .\_/...............\_/