Tri-Turbo diesel BMW 5-series is coming. Very quickly, we imagine.

BMW's new 5-series is set to be the first of the German brand's cars to get a very interesting tri-turbo diesel engine.

The 550dx ('x' indicating that it has four-wheel-drive capabilities) will pack 376bhp and 516lb ft of torque. That frankly epic torque figure is thanks to not one, not two but three turbos.