The other day, I was changing the oil on my '88 740 wagon and everything was going normally until I went to tighten the drain plug back on to the pan. It felt unusually loose and wobbly, like the threads were stripped, so I unscrewed it and took a look at it. I figured and hoped that the threads on the plug itself were the problem, since it wouldn't be difficult nor expensive to throw it away and go get a new plug. Unfortunately, though, it turned out that the plug was fine and the stripping was occurring on the inside of the drain hole on the drain pan. The stripping wasn't too severe, so I was able to wrap a little extra teflon tape around the plug and get it tight enough to hold pretty well for now, but I'm not going to be too comfortable with it over the long run. My question is, is there any realistic way of repairing these internal threads, or do I have to replace the whole damn pan to get the drain plug to fit snugly? Thanks.