Originally Posted by e39_touring

Yes, 3.0. I did the OFHG about a year and a half ago. This current project was mostly underneath - swap differentials, trans work, clutch, oil pan gasket, front axles. The only thing on top this time was the thermostat, but I found this little pin before starting that.

It's got a little wear on one side. I searched through realoem for all the results with the keywords 'pin' or 'dowel' and didn't find anything with these dimensions. I wonder if it could be from a tool...