The low-slung 4-door BMW 850i xDrive Gran Coupe has been caught undergoing testing at the Nurburgring in Germany ahead of its expected revealin 2019.

Image credit:S. Baldauf/SB-Medien

The new 4-door BMW 8 Series Gran Coupe was previewed by the striking M8 Gran Coupe Concept at the 2017 Geneva Motor Show and now an 850i xDrive Gran Coupe prototype has been spied undergoing testing at the famous Nurburgring proving ground.

The 8 Series Gran Coupe is a longer, stretched out version of the 8 Series Coupe to accommodate an extra set of rear doors while still retaining its low-slung profile.

The BMW 850i xDrive seen here will top the 8 Series range until the highly-anticipated M8 Gran Coupe breaks cover. The 850i xDrive is powered by a 4.4-litre twin-turbocharged V8 engine that offers 390 kW and 750 Nm, capable of sprinting from standstill to 100 kph in a claimed 3.7 seconds using a new 8-speed Steptronic transmission.

The 850i Gran Coupe's longer dimensions should giverear passengers ample legroom and will feature the latest technology on BMW's arsenal.

As you would expect, the 8 Series Gran Coupe will be packed with the latest technology including a large 12.3-inch digital instrument cluster and a 10.25-inch infotainment system as well as a comprehensive list of driver assistance systems such as Personal Co-Pilot, active cruise control with braking functionality, collision and pedestrian warning with city braking.

The 8 Series Gran Coupe will go up against rivals such as the Mercedes-Benz CLSand Porsche Panamera. A convertible BMW 8 Series has also been confirmed.

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Rendering: BMW M8