Blown Headgasket, Dowel pin in Oil pan?
 

I am helping a buddy out by replacing the head gasket on his 2008 Non-S Cooper and I have just pulled the oil pan to clean it out and found this dowel pin in the pan. I am not very familiar with these cars and am basically just following the service manual as I go so I would like to know if anybody has an idea what this pin goes to.

http://i18.photobucket.com/albums/b1...5AD5AB2226.jpg