First S65

BMW also considers four different engines for the next generation M the first S65 V8 Biturbo, which will be used for Z4 M and X3 m. The N54 engine modified the S63 engine used in the next generation M5 and the V6 engine based on S these engines are already testing on four separate E9X M3 prototypes, but according to numerous rumors, the choice is most likely to fall on a 6-cylinder engine.