I went to change the oil in my 9-5 this evening, and discovered an odd drainplug. I didn't think much of it, when I unscrewed it, it didn't want to come out all the way. The oil stopped draining, and I went to screw it back in, and it "popped" loose.
Now it will not thread in AT ALL.
It doesn't thread in the normal way (as a bolt), rather it has a threaded shaft that screws into something else, kind of like certain wall anchors do.
In any case, at this moment, I'm screwed and have no way to plug my oil drain.