WTF...First Mercedes and Chrysler. The previous generation (W211) Mercedes E class supposed has a Mitsubishi engine for the E350 sedans and wagons. My 2006 E350 wagon is a POS.
Now an M3 with a Chevy engine! God no! I had a Z24 when I started driving and it was the worst car I've ever had the displeasure of owning.
I hope that it is true that there is no basis for this rumor. Otherwise, I have no choice but to move away from BMW. I will not buy a Mercedes again even though they parted ways with Chrysler.