Focus on efficiency: Vehicle development.

Mercedes-Benz has always sought to optimise the combustion process and other in-engine processes in order to reduce both consumption and CO2 emissions as well as to make combustion cleaner. Hence, the fleet consumption of Mercedes-Benz models has almost halved since 1995. On the technical front, Mercedes-Benz is constantly working to make vehicles more efficient and to lower their consumption. Developers have access to many different ways in which to make an automobile as fuel-efficient as possible while at all times conforming to Mercedes-Benz's standards of safety, design, product quality and performance.

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(Air) resistance is futile: New record.

CLA 180 BlueEFFICIENCY Edition:
Fuel consumption combined: 5.0 l/100 km;
combined CO₂ emissions: 117 g/km.*

An efficient airflow is vital for low fuel consumption under everyday conditions. With a cd value of 0.23, the CLA sets a new record – both within the Mercedes-Benz model range and across all standard-production vehicles. At 0.51 m2, the drag area, vital for airflow resistance, is a top value. With the CLA 180 BlueEFFICIENCY Edition, this best mark is bettered yet again. This time, the cd value is 0.22, while, in terms of drag area, at just 0.49 m², the four-door coupé breaks through a magic threshold.

This excellent airflow was achieved by a host of aerodynamic optimisations. These include a low A-pillar step with modified A-pillar geometry, aerodynamically optimised exterior mirror housings, low-drag wheel covers and indented wheel spoilers on the front and rear wheelhouses. The passage of the air stream under the floor is improved by large-area panelling of the main floor, extra panelling in the central region of the rear axle and an aerodynamically optimised end silencer with adjoining diffuser.

S 560 4MATIC: Fuel consumption combined: 8.8–8.5 l/100 km; combined CO₂ emissions: 200–195 g/km.*

Particulate filter for petrol engines.

What has become standard for diesel engines is now also available for petrol engines: the particulate filter. In the interests of further improved environmental compatibility, Mercedes-Benz will be the first manufacturer to offer the extensive use of particulate filters also for petrol engines. After more than two years of positive field experience in the S 500, the standard-fit petrol particulate filter in the S 560 4MATIC effectively reduces the emissions of fine particulate matter. The system directs the exhaust gas stream into a honeycomb structure, where the particulate matter is trapped. Under appropriate driving conditions, the particulate filter is continuously regenerated. The system will gradually be rolled out in other new vehicle models, model facelifts and new engine generations such as the M 264. It is then planned to launch the particulate filter also in the current model series.

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OM 654: “Exemplary clean exhaust”.

E 220 d:
Fuel consumption combined: 4.3–3.9 l/100 km;
combined CO₂ emissions: 112–102 g/km.*

The OM 654 is the first member of a modular engine family. The all-new stepped-bowl combustion process is employed for the first time in a passenger-car diesel engine. The stepped bowl has a positive effect on combustion as well as on the thermal stressing of critical regions of the piston. All emissions-reducing components are installed on the engine; there is no engine temperature management at cold start or low load. This results in advantages with regard to emissions and fuel savings on short journeys.

The near-engine configuration means low heat loss and optimal operating conditions for the exhaust aftertreatment. The new engine features multi-way exhaust gas recirculation (EGR). It combines cooled high-pressure and low-pressure EGR. Thus, the engine’s untreated emissions were again able to be drastically reduced across the entire map while maintaining a consumption-optimised position for the centre of combustion. Hence, the ADAC praises the E 220 d with OM 654 for its “exemplary clean exhaust”.

NANOSLIDE cylinder wall coating.

Alongside the stepped-bowl combustion process and the combination of an aluminium block with steel pistons, another innovation on the OM 654 is the improvement of the NANOSLIDE® cylinder wall coating. Wires of an iron-carbon alloy are melted in an electrically generated arc. The melted material is sprayed onto the cylinder wall with a gas stream and deposited there as a lamellar, ultra-fine to nano-crystalline layer. Extra-fine finishing creates an almost mirror-like surface with fine pores, which reduce the friction and wear between piston and cylinder wall. Further advantages: reduced engine weight, extremely high wear-resistance and lower consumption and emissions.

Saving fuel with ECO options.

In future, when choosing optional extras, customers will be able to exert a stronger influence than before on the CO2 emissions of their vehicle model. To this end, Mercedes-Benz offers not just a choice of highly efficient engines, but also an array of special features for optimised aerodynamics. The AIRPANEL is optionally available for the E-Class and C-Class with Exclusive Line. If only low cooling is required, the AIRPANEL remains closed. With closed louvres, the radiator shutter helps to improve the vehicle’s aerodynamics, as the air is no longer able to flow through the engine compartment. This reduces not only the drag and fuel consumption, but therefore also the CO2 emissions. When more cooling is required, the louvres are opened. The system is visible from the outside and provides an interesting visual effect.


Consumption is reduced by specially developed AERO wheels with particularly low-friction rolling characteristics and an EU ‘B’ label. The effect is further reinforced in combination with AERO rims, which offer significantly improved aerodynamics thanks to their distinctive design and mainly closed surfaces.