I have encountered the same on a GLB - engine was windowed for no good reason. I think its a really high stress engine which has absolutely no margin for any off tolerance running and goes kaboom.

__________________
2012 BMW X5 (Beef + Granite suspension model)

1995 E300D - The original humming machine (consumed by Flood 2017)
2000 E320 - The evolution (consumed by flood 2017)