The new four-cylinder diesel engine in the E 250 CDI BlueEFFICIENCY model has an output of 150 kW and a peak torque of 500 Nm and a displacement of 2.1 litres. This model develops around seven percent more power and delivers 25 percent more torque than the previous V6 diesel engine with a displacement of three litres whilst consuming around 23 percent less fuel: just 5.8 litres per 100 kilometres (NEDC combined figure), making it far more fuel-efficient than comparable sedans in this performance class. The CO2 emissions figure for the new four-cylinder diesel models is 154 grams per kilometre – up to 24 percent lower than the figures achieved by the previous CDI models.

In a similar vein, the V6 diesel engine for the new E-Class is one of the most sophisticated compression-ignition units on the world market. It offers substantially greater output, comfort and driving enjoyment than other engines thanks to the immense torque of 620 Nm alone, which is available between 1600 and 2400 r/min, ensuring outstanding agility when accelerating from rest and exemplary flexibility when accelerating in any gear. To put this into figures, the E 350 CDI BlueEFFICIENCY model (195 kW) accelerates from 0 to 100 km/h in 6.8 seconds and from 60 to 120 km/h in 6.1 seconds.

Despite the higher output and torque, fuel consumption has been reduced by 0.5 litres to 6.8 litres per 100 kilometres (NEDC combined figure), equivalent to 179 grams of CO2 per kilometre. The 7G-TRONIC seven-speed automatic transmission is specified as standard for the E 350 CDI BlueEFFICIENCY model.