UGH!!! Stupid guys @ Winston Tires overtightened my drain plug (V6 Contour btw), partially stripping it in the process. I've been trying for the last couple weeks to loosen it so that I can change my oil. I started with a box end wrench (15mm) but the head just kept on stripping. Then I tried Craftsman's "Clench Wrench," but that didn't work. Today, I tried a vice grip.... still doesn't work. Anyone have any ideas? I'm trying not to bring it into the dealership because I don't have time during the day, when service dept is open, and I don't want to take time off from work. Any suggestions would be greatly appreciated. Thanks in advance.