2011 Mercedes-Benz S250 CDI: official details, photos specs and price

Article by Christian Andrei, on September 23, 2010

Mercedes-Benz revealed today the S250 CDI BlueEfficiency, and announced that this is the first 5 litres/100 km car in the luxury segment. Powered by a 2.2-liter four-cylinder CDI engine, the new car delivers an impressive 5.7 liters/100 km (41 mpg) as well as 149g of CO2 emissions. 

The small four-cylinder diesel engine mated to a 7G-Tronic Plus 7-speed automatic transmission, generates 204 hp (150 kW) and a maximum torque of 500 Nm.

Still, the vehicle can accelerate to 100 km/h (62 mph) in just 8.2 seconds and has a top speed of 240 km/h (150 mph). These performances are a result of two-stage turbocharging, which consists of a small high-pressure (HP) turbocharger and a large low-pressure (LP) turbocharger.

These two are connected in series, and each has a turbine and a compressor driven by this turbine. The HP turbine is located directly at the exhaust manifold and allows the exhaust gas to low through it and then rotates at up to 215,000 revolutions per minute.

The HP turbine housing features an integral bypass duct, which can be opened or closed by means of a charge-pressure control flap triggered by a vacuum cell. 

The advantage of this technology is that it delivers high torque at low engine speeds, while fuel consumption is reduced. Pricing starts at €71,876 ($95,942).

Press Release

New engines for the S-Class: The new standard for efficiency

With a total of four new diesel and petrol engines, the Mercedes-Benz S-Class defines the efficiency standard in its segment. The accolade of "the world's most economical luxury saloon" goes to the new S 250 CDI BlueEFFICIENCY. This high-tech turbodiesel is the first four-cylinder engine in the almost 60-year success story of the S-Class. Developing an output of 150 kW (204 hp), the S 250 CDI BlueEFFICIENCY achieves a fuel consumption of just 5.7 litres per 100 kilometres (NEDC), corresponding to CO2 emissions of 149 grams per kilometre. The likewise new V6 diesel in the S 350 BlueTEC delivers 190 kW (258 hp) and has a combined consumption of 6.8 litres per 100 kilometres (177 g CO2/km). Thanks to AdBlue®emission control, it is one of the world's cleanest diesel engines. With 225 kW (306 hp) in the S 350 BlueEFFICIENCY and 320 kW (435 hp) in the S 500 BlueEFFICIENCY, the new BlueDIRECT engine generation is now entering the lists in the form of V6 and V8 petrol variants.

"The new highly efficient petrol and diesel engines in the S-Class demonstrate that our customers are also able to drive a luxury class car with a clear conscience," saysDr. Thomas Weber, the member of the Daimler AG Executive Board responsible for corporate research and development at Mercedes-Benz Cars. "More than ever before, the luxury saloon combines the leadership claim of Mercedes-Benz with respect to efficient drive systems with the classic brand strengths in the realms of design, safety, comfort and effortlessly superior performance".

All the diesel and petrol engines have direct injection

Mercedes-Benz achieves the considerable reduction in fuel consumption and improvement in efficiency with an intelligent combination of technical innovations that take effect throughout the entire powertrain: in addition to direct injection in the diesel engines, as well as in the new V6 and V8 BlueDIRECT petrol engines, these include the extensively revised, high-efficiency 7G-TRONIC PLUS 7-speed automatic transmission and the ECO start/stop function. This high-tech package is supplemented with other specific BlueEFFICIENCY measures such as the load-controlled oil pump and tyres with lower rolling resistance.

The four-cylinder diesel in the S 250 CDI BlueEFFICIENCY is equipped with latest-generation common-rail direct injection. The high rail pressure of 2000 bar enables output and torque figures at the level of a six-cylinder diesel to be achieved.

In the S 350 BlueEFFICIENCY and S 500 BlueEFFICIENCY, the newly developed BlueDIRECT technology package ensures a lower fuel consumption together with increased power. The key factor is third-generation spray-guided direct petrol injection with multiple injection and multi-spark ignition. With the innovative V6 and V8 petrol units, Mercedes-Benz is founding a family of engines with a wide range of displacements and outputs. This is based on a flexible, modular concept that allows the integration of turbochargers, and combination with 4MATIC all-wheel drive as well as hybrid modules.

Fuel economy: ECO start/stop function

The excellent consumption and emission figures are also due to the new ECO start/stop function. This is standard equipment in the S 250 CDI BlueEFFICIENCY as well as the petrol-powered S 350 BlueEFFICIENCY and S 500 BlueEFFICIENCY models. The ECO start/stop function switches the engine off as soon as the vehicle stops - for example at traffic lights – and the driver keeps the brake pedal depressed after coming to a halt. The engine restarts immediately when the driver takes his foot from the brake pedal.

The ECO start/stop function will not switch the engine off if e.g. the desired interior temperature has yet to be reached, if the driver has switched off the system or if drive modes "S" or "M" are active. An intelligent control system ensures that all functions and comfort systems otherwise remain in operation during the stop phase.

S 250 CDI BlueEFFICEINCY: first 5 litres/100 km car in the luxury segment

With the new S 250 CDI BlueEFFICIENCY, Mercedes-Benz is now launching the world's most fuel-efficient luxury saloon. The first four-cylinder engine in the more than 60-year success story of the S-Class attains a fuel consumption of just 5.7 litres per 100 kilometres, corresponding to CO2 emissions of 149 grammes per kilometre. This makes the new S 250 CDI BlueEFFICIENCY the first car in the luxury segment to run on under 6 litres of fuel per 100 km, and the first vehicle in its class to attain CO2 emissions below the 150 gramme mark. With a peak power output of 150 kW (204 hp) and maximum torque of 500 Newton metres, the four-cylinder CDI guarantees the superior performance which is a hallmark of the S-Class. It accelerates the large saloon from 0 to 100 km/h in 8.2 seconds, and attains a top speed of 240 km/h.

The 2.2-litre CDI engine already delivers its maximum torque of 500 Nm at 1600 rpm. The high torque at low engine speeds is a result of two-stage turbocharging. This technology, which is employed in a series-production passenger car diesel engine for the first time in the C and E-Class, is predominantly responsible for the high output at the level of a six-cylinder power unit.

The compact module for the two-stage turbocharger consists of a small high-pressure (HP) turbocharger and a large low-pressure (LP) turbocharger. These are connected in series, and each has a turbine and a compressor driven by this turbine. The HP turbine is located directly at the exhaust manifold and initially allows exhaust gas to flow through it; it then rotates at up to 215,000 revolutions per minute. The HP turbine housing features an integral bypass duct, which can be opened or closed by means of a charge-pressure control flap triggered by a vacuum cell. If the flap is closed, the whole exhaust stream flows through the HP turbine, so that the exhaust-gas energy is available solely for the HP turbine drive. This means that the optimum charge pressure can be built up at low engine revs.

Improved cylinder charging even at low rpm

The two compressors are likewise connected in series, and are in addition connected to a bypass duct. The combustion air from the air filter first flows through the low-pressure compressor, where it is compressed as a function of the LP turbine's output. This pre-compressed air then passes into the high-pressure compressor, which is coupled to the HP turbine, where it undergoes further compression. The result is a genuine two-stage turbocharging process. The major advantage of this sophisticated, demand-related control of the combustion air supply using two turbochargers is improved cylinder charging, and therefore high torque even at low engine speeds. Fuel consumption is also reduced. When the car is driven, this concept makes itself felt by harmonious driving characteristics with no turbo-lag, a favourable torque curve across the entire engine speed range, great responsiveness and excellent performance.

Fourth-generation common rail technology

A further feature of the innovative and highly efficient diesel engine is fourth-generation common rail direct injection. The rail pressure of 2000 bar is essential for the delivery of 150 kW (204 hp) of engine output and maximum torque of 500 Nm, while achieving low untreated emissions.

Dynamically controlled engine mounts dampen vibrations

To ensure hallmark S-Class comfort, dynamically controlled engine mounts feature as an innovation in the new S 250 CDI BlueEFFICIENCY. The rigidity and damping of these mounts alter according to engine speed, load and vehicle speed, thus preventing the transmission of unwanted vibrations and noise from the engine to the body.

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