The sedan will be available from July, and the tourer at end-2017.
The most powerful diesel engine in the segment is also the most powerful 6-cylinder diesel in any car worldwide.
The in-line engine has a capacity of 3.0 litres as well as modern M Performance TwinPower Turbo Technology with four turbochargers.
It has an output of 400hp at 4,400rpm and puts a maximum torque on stream of 760Nm from 2,000rpm.
Power transmission is via a standard 8-speed Steptronic sports transmission.
The intelligent all-wheel drive system BMW xDrive distributes the drive power to all four wheels.
The BMW M550d xDrive accelerates in 4.4 seconds from zero to 100 km/h, and its maximum speed is 250 km/h (electronically cut off).
Exterior highlights include the M aerodynamic package, the M sports suspension lowered by 10mm, the Integral Active Steering and the 19-inch M light alloy wheels with mixed tyres.
On the inside, you have the optional M sports seats with Dakota leather or fabric/Alcantara covers and an M sports leather steering.
