To this day, the N73 stands as BMW's last ever naturally-aspirated V-12 engine and another marker of the end of an era. The S55 twin-turbocharged 3.0-liter inline-six ushered in a new era of turbo ...

When the BMW M4 and S55 engine debuted in 2014, enthusiasts went wild - with displeasure. Although the straight-six was back, ...

BMW offers several different flavors ... said “the block and internals are unique to this engine.” Like most modern powerplants the S55 features a weight-saving aluminum block and head.