Well I don't have a M5 but last night my 2013 X5M engine seized (along went the power steering) as I was going downhill, almost ran into the hillside because the car lost power and I had to labor (never knew steering is so heavy without the power assist) to turn the car around the corner.
The engine malfunction light lit up, transmission was in netural for some reason. I put the car back in park and start the engine, and the car goes fine again.
Already contacted my sales and taking the car in first thing in the morning. I was lucky that I didn't drove into the hillside or that there wasn't a fast car following me, the person could have rear-ended me because I basically just came to a stop unexpectedly.