Thanks - yes, I am aware of the benefits for owners in the US.
Specifically, my situation is that I am in Germany and the same consideration is not applied to US-spec vehicles at the German BMW dealerships here.
So I am looking for other US-spec M3 owners inputs from here in Germany.
Quotes I have so far are:
K'town Euler: 400 Euro with VAT form
Landstuhl Euler: 200 Euro with VAT form (even though the service dept lady spoke english, I don't trust that she knows what I was talking about)
Looks like I'll have to invest in some 10w60!