Last year I stripped my oil drain hole and ended up putting a recoil in it to repair it. After the repair I still had a little oil leak. I believe the oil was just getting around the recoil. So I put a spark plug washer on the drain bolt because it would seal the leak and it did. But it only will last one oil change and then the washer is unuasable again. Does anyone have a suggestion on what to do to keep this from leaking? Is there any other type of washers that I could use that will last longer than a spark plug washer?