Comparison Mercedes-Benz S-class (W221, facelift 2009) S 500 BlueEFFICIENCY (435 Hp) 4MATIC G-TRONIC & Mercedes-Benz SLK (R172) AMG SLK 55 (422 Hp) G-TRONIC
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| Brand: | Mercedes-Benz | Mercedes-Benz |
| Model: | S-class | SLK |
| Generation: | S-class (W221, facelift 2009) | SLK (R172) |
| Engine / modification: | S 500 BlueEFFICIENCY (435 Hp) 4MATIC G-TRONIC | AMG SLK 55 (422 Hp) G-TRONIC |
| Production start: | 2011 year | 2012 year |
| Production end: | 2013 year | 2015 year |
| Coupe type: | Sedan | Cabriolet |
| Num. of Doors: | 4 | 2 |
| Num. of seats: | 5 | 2 |
| Fuel consumption / economy - urban: | 13.8 l/100 km | 12.0 l/100 km |
| Fuel consumption / economy - extra urban: | 7.5-7.6 l/100 km | 6.2 l/100 km |
| Fuel consumption / economy - combined: | 9.8 l/100 km | 8.4 l/100 km |
| Fuel Type: | Petrol (Gasoline) | Petrol (Gasoline) |
| Fuel tank volume: | 83 l | 70 l |
| Emission standard: | Euro 5 | Euro 5 |
| CO2 emissions: | 228-229 g/km | 195 g/km |
| Power: | 435 hp | 422 hp |
| Max power in: | 5250 rpm. | 6800 rpm. |
| Maximum speed: | 250 km/h | 250 km/h |
| Acceleration from 0 to 100 km/h: | 5 sec | 4.6 sec |
| Torque: | 700 Nm @ 1800-3500 rpm. | 540 Nm @ 4500 rpm. |
| Model Engine: | M 278.932 | |
| Engine position: | Front, longitudinal | Front, longitudinal |
| Engine displacement: | 4663 cm3 | 5461 cm3 |
| Engine oil capacity: | 8.5 l | |
| Fuel System: | Direct injection | Direct injection |
| Aspiration / Turbine: | Twin-Turbo | Turbocharging |
| Position of cylinders: | V engine | V engine |
| Number of cylinders: | 8 | 8 |
| Number of valves per cylinder: | 4 | |
| Compression ratio: | 10.5 | 12.6 |
| Wheel Drive: | All wheel drive (4x4) | Rear wheel drive |
| Number of Gears (automatic transmission): | 7G-TRONIC | 7G-TRONIC PLUS |
| Length: | 5096 mm | 4134 mm |
| Width: | 1871 mm | 1810 mm |
| Width including mirrors: | 2120 mm | |
| Height: | 1479 mm | 1301 mm |
| Wheelbase: | 3035 mm | 2430 mm |
| Front track: | 1600 mm | 1559 mm |
| Rear (Back) track: | 1606 mm | 1565 mm |
| Front overhang: | 888 mm | |
| Rear overhang: | 1173 mm | |
| Minimum volume of Luggage (trunk): | 560 l | 225 l |
| Maximum amount of Luggage (trunk): | 335 l | |
| Front suspension: | Independent multi-link | |
| Rear suspension: | Multi-link independent | |
| Max weight: | 2685 kg | 1910 kg |
| Front brakes: | Disc | Ventilated discs |
| Rear brakes: | Disc | Disc |
| Kerb Weight: | 2000 kg | 1610 kg |
| ABS: | yes | yes |
| Steering type: | Steering rack and pinion | Steering rack and pinion |
| Power steering: | Electric Steering | |
| Minimum turning circle (turning diameter): | 11.8 m | 10.53 m |
| Tire size: | 255/45 R18 | 235/40 R18 |
| Wheel rims size: | R18 | R18 |