As reported on
Homepage.
The big question BMW enthusiasts have wondered about the upcoming F10 M5 was what powerplant it would receive - a twin turbo V8 (from the X5/X6 M) or the 5.0L V10. It had been reported (and seen) that BMW was testing both the turbo V8 and V10 motors in the F10 M5 test mules spotted in Germany.
Edmunds Inside Line is now reporting that BMW insiders have confirmed that the next F10 M5 engine will be BMW's
turbocharged 4.4L V8 as seen in the current X6M / X5M. And although many ///M purists will lament the switch to a forced induction engine from BMW M's traditional naturally aspirated powerplants, this motor will pump out at least 555hp / 500tq (but possibly even more for the M5) while getting greater gas efficiency. This decision is in line with what has been confirmed for the next M3 as well - that it will be powered by a turbo V6 engine (instead of the current NA V8).