There are several possibilities.
Mine is detailed in this thread, that includes some of those possibilities and what mine (although I have the V8) turned out to be:
http://f15.bimmerpost.com/forums/sho....php?t=1286526
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RIP: 2013 M6 Convertible, 2011 750Li, 2009 750i, 2008 Mini Clubman - and more other makes and models than I can count!