Mercedes-Benz will be making a play for user chooser business with its new M-Class model with a low-CO2 four-cylinder version.

The third-generation M-Class will arrive in the UK in April 2012, and the range will start with a new ML 250 Bluetec diesel producing CO2 emissions of 158g/km and with fuel consumption of 47mpg on the combined cycle.

It's a version of the 204bhp twin-turbo 2.2-litre diesel currently offered in C-Class, E-Class and CLS model, and also in the S-Class in other European markets.

The engine matches the power and torque output of the previous six-cylinder ML 300CDI, but its CO2 emissions are 66g/km lower, while fuel consumption is improved by up to 15mpg on the combined cycle.

Improvements in fuel consumption and CO2 emissions have been made across the range, with the new ML 350 CDI achieving 179g/km and 41.5mpg, and the petrol ML 350 at 199g/km and 33.2mpg. Both diesel engines meet EU6 requirements.

New technology as well as aerodynamic aids to reduce drag have helped achieve the gains.

Off-road performance is improved by the 'ON&OFFROAD' package, with selectable programs for different conditions. The package also includes an underride guard, a two-stage transfer case with reduction gear, a longitudinal differential lock and enhanced AIRMATIC functionality that allows a maximum ground clearance of 285mm and a fording depth of 600mm.

The new model will be available with a range of new safety technology, and prices will be announced closer to the launch date.