I changed my oil and replaced the copper washer. It appears the previous owner had some problems with the lower drain plug dripping and or stripped it because he put some silicone on a rubber washer and plug to keep it from leaking, I can't get the plug to tighten. Now that my plug is stripped (bottom of case) has anyone dealt with this problem? What did you do to fix it? I was thinking of a self tapping drain plug or a "repair kit" of some kind.