Comparison Mercedes-Benz S-class (W221, facelift 2009) S 350 CDI BlueTEC (258 Hp) 4MATIC G - TRONIC & Mercedes-Benz SLK (R171, facelift 2008) SLK 350 V6 (305 Hp)
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| Brand: | Mercedes-Benz | Mercedes-Benz |
| Model: | S-class | SLK |
| Generation: | S-class (W221, facelift 2009) | SLK (R171, facelift 2008) |
| Engine / modification: | S 350 CDI BlueTEC (258 Hp) 4MATIC G - TRONIC | SLK 350 V6 (305 Hp) |
| Production start: | 2010 year | 2008 year |
| Production end: | 2013 year | 2011 year |
| Coupe type: | Sedan | Roadster |
| Num. of Doors: | 4 | 2 |
| Num. of seats: | 5 | 2 |
| Fuel consumption / economy - urban: | 9.9-10.1 l/100 km | |
| Fuel consumption / economy - extra urban: | 5.8-5.9 l/100 km | |
| Fuel consumption / economy - combined: | 7.3-7.4 l/100 km | |
| Fuel Type: | Diesel | Petrol (Gasoline) |
| Drag coefficient: | 0.32 | |
| Fuel tank volume: | 83 l | 70 l |
| Emission standard: | Euro 6 | Euro 5 |
| CO2 emissions: | 193-195 g/km | |
| Power: | 258 hp | 305 hp |
| Max power in: | 3600 rpm. | 6500 rpm. |
| Maximum speed: | 250 km/h | 250 , Electronically limited km/h |
| Acceleration from 0 to 100 km/h: | 7.1 sec | 5.4 sec |
| Torque: | 620 Nm @ 1600-2400 rpm. | 360 Nm @ 4900 rpm. |
| Model Engine: | OM 642.868 | M 272.969 |
| Engine position: | Front, longitudinal | Front, longitudinal |
| Engine displacement: | 2987 cm3 | 3498 cm3 |
| Engine oil capacity: | 8.0 l | 8 l |
| Coolant: | 10.2 l | |
| Fuel System: | Diesel Commonrail | |
| Aspiration / Turbine: | Turbocharger / Intercooler | |
| Position of cylinders: | V engine | |
| Valvetrain: | DOHC | |
| Number of cylinders: | 6 | 6 |
| Number of valves per cylinder: | 4 | 4 |
| Compression ratio: | 15.5 | 11.7 |
| Piston Stroke: | 86 mm | |
| Cylinder Bore: | 92.9 mm | |
| Wheel Drive: | All wheel drive (4x4) | Rear wheel drive |
| Number of Gears (automatic transmission): | 7G-TRONIC | |
| Number of Gears (manual transmission): | 6 | |
| Length: | 5096 mm | 4107 mm |
| Width: | 1871 mm | 1788 mm |
| Width including mirrors: | 2120 mm | 2005 mm |
| Height: | 1479 mm | 1298 mm |
| Wheelbase: | 3035 mm | 2430 mm |
| Front track: | 1600 mm | 1526 mm |
| Rear (Back) track: | 1606 mm | 1549 mm |
| Front overhang: | 888 mm | |
| Rear overhang: | 1173 mm | |
| Minimum volume of Luggage (trunk): | 560 l | 208 l |
| Max weight: | 2660 kg | 1800 kg |
| Front brakes: | Disc | Ventilated discs |
| Rear brakes: | Disc | Ventilated discs |
| Kerb Weight: | 1990 kg | 1430 kg |
| ABS: | yes | |
| Steering type: | Steering rack and pinion | Steering rack and pinion |
| Power steering: | Hydraulic Steering | |
| Max. roof load: | 50 kg | |
| Minimum turning circle (turning diameter): | 11.8 m | 10.51 m |
| Tire size: | 235/55 R17 | Front wheel tires: 225/45 R 17 |
| Wheel rims size: | R17 | Front wheel rims: 7.5 J x 17 |