These are the latest spy pictures of the new BMW M5 in winter testing.

The new performance saloon, known internally under the codename F10M and due to make its first public appearance at the Frankfurt motor show in 2011, is set to mark a major departure from its predecessors by adopting turbocharging for the first time.

See the latest BMW M5 spy pictures

The decision is part of the drive to cut fuel consumption, a key element of BMW’s Efficient Dynamics programme. M division’s head of development, Albert Biermann, has previously told Autocar the new driveline will also receive taller gearing, helping to cut CO2 emissions by 20 per cent, from 344g/km to around 275g/km.

The engine’s output remains secret. But with the same unit pumping out 555bhp in the X5 and X6 M, the new car should stick to the M5 tradition of being more powerful than the car it replaces.

The most noticeable difference will be the way the new engine delivers its power. The V10’s 500bhp comes at 7750rpm, but the V8’s peak power should arrive at not much more than 6000rpm.

More than outright power, though, it is the added torque that is likely to bring the biggest change in character. Biermann indicated there will be a 30 per cent increase, taking torque from today’s 383lb ft at 6100rpm to somewhere around 500lb ft at little more than 1500rpm. Biermann is also confident the V8’s unique induction system will provide similar levels of throttle response to those of today’s model.

Although BMW has just introduced a new petrol-electric hybrid system on its new Active Hybrid 7, it has not been considered for the M5 due to the 100kg it adds to the car’s weight.

Weight saving is playing a big part in the M5’s development, with carbonfibre being used in the bodyshell. BMW is working on a carbonfibre roof and bootlid, mainly because, being sited on top of the car, they are less vulnerable to impact damage.

At the same time, a lot of effort is going into honing the aerodynamics at BMW’s new wind tunnel in Munich. The car will get Active Aerodynamics, which blanks off parts of the grille and cooling intakes during warm-up and under light throttle load.

The new M5 will continue the car’s tradition of visual understatement with a muscular appearance. LED lighting will be used to enhance the look and differentiate the M5 from the standard 5-series, a new generation of which is due next month.

Underneath, there will be new double-wishbone front suspension in place of the MacPherson strut set-up that has been a mainstay of the M5. It will be combined with multi-link rear suspension.

As with today’s model, active dampers will be used to provide the driver with the choice of differing levels of ride comfort. They will be part of a new chassis system that also includes reworked traction and stability management.

The M5 will also get new, fully electric power steering, described by Biermann as a third-generation system that offers similar levels of response and feedback to today’s hydraulic set-up.

Pics: Carparazzi

Twitter - follow autocar.co.ukSee all the latest BMW 5-series reviews, news and video