The next-gen BMW M5 will adopt a plug-in-hybrid powertrain. The brand is now back at the Nürburgring to develop the new sport sedan. This video catches several of them on the famous track and driving on the public roads in the area.
The M5 PHEV reportedly shares a powertrain with the BMW XM. If so, it would have a twin-turbo 4.4-liter V8 with a single electric motor and a 29.5-kilowatt-hour battery. Assuming the tuning is the same as in the SUV, the sedan would have 644 horsepower and 590 pound-feet of torque. The XM Label Red pushes these figures to 735 hp and 735 lb-ft, so there is a wide range for setting up the M5.
