Petrol engines - efficiency and performance

Model Cylinder arrangement and number Displacement (cc) Rated output (kW at rpm)[1] Top speed (km/h) Fuel consumption, combined (l/100 km)[2] CO2 emissions combined (g/km)[2]
SLK 200 BlueEFFICIENCY R4 1796 135/5.250 (135/5.250) 240 (237) 6,4–6,8 (6,1–6,5) 149–158 (142–151)
SLK 250 BlueEFFICIENCY R4 1796 – (150/5500) – (243) – (6,2–6,6) – (144–153)
SLK 350 BlueEFFICIENCY V6 3498 – (225/6500) – (250)[3] – (7,1) – (167)

Power towards the sun

The petrol engines available for the new SLK are just right for giving unadulterated roadster driving pleasure. They are optimally tuned to meet the requirements of this class of vehicle. In addition, all the petrol engines, whether 4, 6 or 8-cylinder, deploy cutting-edge technology and combine smooth running characteristics and ecological efficiency with the ultimate in agility and driving dynamics.

4-cylinder petrol engines

The optimised 4-cylinder powerplant with a displacement of 1.8 litres, direct petrol injection, two overhead camshafts, variable valve timing and turbocharger, offers outstanding torque and power, not to mention appropriately low fuel consumption and emissions.

You can choose between the following models: SLK 200 BlueEFFICIENCY and SLK 250 BlueEFFICIENCY:

  • Optimised combustion through the direct petrol injection: uses fuel more efficiently.
  • Variable valve control for optimum cylinder charging: benefits consumption through reduced weight and lower internal friction.
  • A smoother ride and the greatest ride comfort: two balancer shafts ensure minimum vibration across the whole engine speed range.
  • Power you can hear: a sound generator provides a sporty sound.
  • Resource-preserving mobility: the ECO start/stop function saves fuel and thus goes easy on the environment.
  • Incentive to save: the ECO display in the speedometer section of the instrument cluster allows the driver to check his driving for efficiency and, where appropriate, to modify it.
  • Environmentally friendly: both engines meet the stricter limits for consumption and emissions (Euro 5) but still deliver top values for torque, output and noise levels.
6-cylinder petrol engine

The powerful 3.5-litre V6 engine in the SLK 350 BlueEFFICIENCY combines refinement and ecological efficiency with the highest degree of agility and dynamism. It achieves this with features such as direct fuel injection and its four-valve-per-cylinder design.

  • Efficient combustion: spray-guided combustion with high-pressure injection via piezo injectors.
  • Conservation of resources: fuel consumption more than 20 percent lower than that of preceding model, with correspondingly lower CO2 emissions yet increased dynamism.
  • Intelligent efficiency technologies: a reduction in fuel consumption is assisted by a more advanced combustion process, the standard-fit ECO start/stop function, an optimised air and exhaust gas system, regulated auxiliary components, intelligent alternator management and consistent implementation of lightweight construction principles.
  • Incentive to save: the ECO display in the speedometer section of the instrument cluster allows the driver to check his driving for efficiency and, where appropriate, to modify it.
  • Motoring enjoyment at every engine speed: the engine delivers powerful acceleration even at low rev speeds, displaying great refinement over the entire speed range.
  • Power you can hear: a special resonance intake manifold ensures a powerful engine sound.

[1] Figures for rated output and rated torque in accordance with Directive 80/1269/EEC in the currently applicable version.[2] The figures shown for fuel consumption and CO2 emissions were obtained in accordance with the prescribed measuring process (Regulation [EC] 715/2007 in its currently applicable version). The figures are not based on an individual vehicle and do not constitute part of the product offer; they are provided solely for purposes of comparison between different vehicle models.[3] Electronically limited.