/Mercedes S250 CDI BlueEFFICIENCY

Mercedes S250 CDI BlueEFFICIENCY

2010 Mercedes S250 CDI 1 at Mercedes S250 CDI BlueEFFICIENCY

Economy is probably the last on your mind when you deiced you want a Mercedes Benz  S-Class. You probably think of the V8 model, or even one of those awesome AMG variants. But Mercedes, being a sensible car maker offers the car with a V6 as well. Now though, they’ve gone one step further and offer this big and luxurious car with a four-cylinder DIESEL engine! With average fuel consumption of 5.7 litres per 100 kilometres, the S250 CDI is “the world’s most economical luxury saloon”.

2010 Mercedes S250 CDI 2 at Mercedes S250 CDI BlueEFFICIENCY

The first four-cylinder engine in the more than 60-year success story of the S-Class is also the the first car in the luxury segment to run on under 6 litres of fuel per 100 km. It also has low emissions at 149 grammes of per kilometre.

The 2.2-litre CDI engine benefits from two-stage turbocharging which makes it capable of a peak power output of 150 kW (204 hp) and maximum torque of 500 Newton metres. It accelerates the large saloon from 0 to 100 km/h in 8.2 seconds, and attains a top speed of 240 km/h.

2010 Mercedes S250 CDI 3 at Mercedes S250 CDI BlueEFFICIENCY

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.

2010 Mercedes S250 CDI 4 at Mercedes S250 CDI BlueEFFICIENCY

Key figures for the four-cylinder diesel engine
Cylinder number/arrangement
4/in-line
Displacement (cc)
2143
Bore (mm)
83
Stroke (mm)
99
Compression ratio
16.2 : 1
Output (kW at rpm)
150 at 4200 rpm
Torque (Nm at rpm)
500 at 1600-1800 rpm

2010 Mercedes S250 CDI BlueEFFICIENCY is priced form 71,876 Euros.

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