I think the guy who did my last oil change (to the good purple stuff) cranked down on the drain bolt so hard that it created a "dent" where the bolt goes in. Now, the bolt is leaking about 4 or 5 drips a day. I know I could wait three months to change it again but the question is - HOW DO I STOP THIS LEAKING FOR GOOD? Is there a rubber washer to use instead of the steel one? I think that would do it but I don't know if it would melt the darn thing. THANKS!