OP - I'm sorry to hear about your issue. I have experienced a blown motor (NOT on a BMW) and understand your frustration. Please let us know any details you uncover so that we can be sure we know the warning signs and any preventative things that can be done.
'08 E90 M3 - Alpine White - Sold
'13 E92 M3 - Silverstone II - Sold
'13 E92 M3 - Alpine White - BBS E88, JRZ, Akrapovic, AP Racing
'04 E46 M3 - Jet Black - BBS E88, KW Clubsports, Brembo BBK, SuperSprint Exhaust, Recaro - FOR SALE