Comparison Mercedes-Benz S-class Long (W221) S 320 CDI (235 Hp) 4MATIC G-TRONIC & Mercedes-Benz S-class Long (W221, facelift 2009) S 500 V8 (388 Hp) 4MATIC G-TRONIC & Mercedes-Benz SLK (R171, facelift 2008) AMG SLK 55 V8 (360 Hp) 7G-TRONIC
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| Brand: | Mercedes-Benz | Mercedes-Benz | Mercedes-Benz |
| Model: | S-class | S-class | SLK |
| Generation: | S-class Long (W221) | S-class Long (W221, facelift 2009) | SLK (R171, facelift 2008) |
| Engine / modification: | S 320 CDI (235 Hp) 4MATIC G-TRONIC | S 500 V8 (388 Hp) 4MATIC G-TRONIC | AMG SLK 55 V8 (360 Hp) 7G-TRONIC |
| Production start: | 2006 year | 2009 year | 2008 year |
| Production end: | 2009 year | 2011 year | 2011 year |
| Coupe type: | Sedan | Sedan | Roadster |
| Num. of Doors: | 4 | 4 | 2 |
| Num. of seats: | 5 | 5 | 2 |
| Fuel consumption / economy - urban: | 12-12.2 l/100 km | 16.8-16.9 l/100 km | |
| Fuel consumption / economy - extra urban: | 7.1-7.3 l/100 km | 8.1-8.2 l/100 km | |
| Fuel consumption / economy - combined: | 8.7-8.9 l/100 km | 11.3-11.4 l/100 km | |
| Fuel Type: | Diesel | Petrol (Gasoline) | Petrol (Gasoline) |
| Drag coefficient: | 0.32 | ||
| Fuel tank volume: | 90 l | 90 l | 70 l |
| Emission standard: | Euro 4 | ||
| CO2 emissions: | 227-231 g/km | 264-266 g/km | |
| Power: | 235 hp | 388 hp | 360 hp |
| Max power in: | 3600 rpm. | 6000 rpm. | 5750 rpm. |
| Maximum speed: | 250 km/h | 250 km/h | 250 , Electronically limited km/h |
| Acceleration from 0 to 100 km/h: | 7.8 sec | 5.4 sec | 4.9 sec |
| Torque: | 540 Nm @ 1600-2400 rpm. | 530 Nm @ 2800-4800 rpm. | 510 Nm @ 4000 rpm. |
| Model Engine: | M 113 E 55/113.989 | ||
| Engine position: | Front, longitudinal | Front, longitudinal | Front, longitudinal |
| Engine displacement: | 2987 cm3 | 5461 cm3 | 5439 cm3 |
| Engine oil capacity: | 9.5 l | ||
| Coolant: | 11.5 l | ||
| Fuel System: | Diesel Commonrail | Multi-point injection | |
| Aspiration / Turbine: | Turbocharger | ||
| Position of cylinders: | V engine | V engine | |
| Valvetrain: | DOHC | SOHC | |
| Number of cylinders: | 6 | 8 | 8 |
| Number of valves per cylinder: | 4 | 4 | 3 |
| Compression ratio: | 18 | 10.7 | 11 |
| Piston Stroke: | 92 mm | 92 mm | |
| Cylinder Bore: | 83 mm | 97 mm | |
| Wheel Drive: | All wheel drive (4x4) | All wheel drive (4x4) | Rear wheel drive |
| Number of Gears (automatic transmission): | 7G-TRONIC | 7G-TRONIC | 7 |
| Length: | 5209 mm | 5226 mm | 4103 mm |
| Width: | 1872 mm | 1871 mm | 1788 mm |
| Width including mirrors: | 2115 mm | 2120 mm | 2005 mm |
| Height: | 1473 mm | 1479 mm | 1271 mm |
| Wheelbase: | 3165 mm | 3165 mm | 2430 mm |
| Front track: | 1604 mm | 1600 mm | 1524 mm |
| Rear (Back) track: | 1606 mm | 1606 mm | 1549 mm |
| Front overhang: | 871 mm | 888 mm | |
| Rear overhang: | 1173 mm | 1173 mm | |
| Minimum volume of Luggage (trunk): | 560 l | 560 l | 208 l |
| Front suspension: | Pneumatic elastic element | ||
| Rear suspension: | Pneumatic elastic element | ||
| Max weight: | 2655 kg | 2660 kg | 1850 kg |
| Front brakes: | Ventilated discs | Disc | Ventilated discs |
| Rear brakes: | Disc | Disc | Ventilated discs |
| Kerb Weight: | 1995 kg | 2000 kg | 1500 kg |
| ABS: | yes | yes | |
| Steering type: | Steering rack and pinion | Steering rack and pinion | Steering rack and pinion |
| Power steering: | Hydraulic Steering | ||
| Max. roof load: | 50 kg | ||
| Minimum turning circle (turning diameter): | 12.2 m | 10.51 m | |
| Tire size: | 235/55 R17 | 255/45 R18 | Front wheel tires: 225/40 R 18 |
| Wheel rims size: | 8J x 17 | R18 | Front wheel rims: 7.5 J x 18 |