The stock Honda bolt for my oil pan is dissimilar to the one currently in place. I'm wondering if the original owner overtightened the original bolt, stripping the threads from the bolt-hole. A repair may have used a threaded insert, tapped in and used to fit a smaller bolt. Does this sound like it could be true? My current hex-head was ruined because it was in too tight: it was chewed up badly in getting it to loosen. So, I went to replace it by ordering the stock part, and the stock part has a much coarser thread and is a longer bolt. That is, they are obviousy different. I guess I'm faced with continuing to use the chewed-up bolt. Comment?