Comparison Mercedes-Benz R-class (W251) R 500 4MATIC (388 Hp) & Mercedes-Benz W121 Sedan 190 (75 Hp) & Mercedes-Benz S-class Coupe (C140) 500 SEC V8 (320 Hp) Automatic
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| Brand: | Mercedes-Benz | Mercedes-Benz | Mercedes-Benz |
| Model: | R-class | Ponton | S-class |
| Generation: | R-class (W251) | W121 Sedan | S-class Coupe (C140) |
| Engine / modification: | R 500 4MATIC (388 Hp) | 190 (75 Hp) | 500 SEC V8 (320 Hp) Automatic |
| Production start: | 2007 year | 1956 year | 1992 year |
| Production end: | 2014 year | 1959 year | 1993 year |
| Coupe type: | Combi | Sedan | Coupe |
| Num. of Doors: | 5 | 4 | 2 |
| Num. of seats: | 5 | 5 | 4 |
| Fuel consumption / economy - urban: | 18.2-18.4 l/100 km | 17.7 l/100 km | |
| Fuel consumption / economy - extra urban: | 9.8-10.0 l/100 km | 10 l/100 km | |
| Fuel consumption / economy - combined: | 12.9-13.1 l/100 km | 8.9 l/100 km | 13.2 l/100 km |
| Fuel Type: | Petrol (Gasoline) | Petrol (Gasoline) | Petrol (Gasoline) |
| Fuel tank volume: | 80 l | 56 l | 100 l |
| Emission standard: | EURO V | ||
| Power: | 388 hp | 75 hp | 320 hp |
| Max power in: | 6000 rpm. | 4600 rpm. | 5600 rpm. |
| Maximum speed: | 250 km/h | 140 km/h | 250 km/h |
| Acceleration from 0 to 100 km/h: | 6.1 sec | 20.5 sec | 7.3 sec |
| Torque: | 530 Nm/2800-4800 rpm. | 136 Nm @ 2800 rpm. | 470 Nm @ 3900 rpm. |
| Model Engine: | M 121 B I / 121.920 | ||
| Engine position: | Front, longitudinal | Front, longitudinal | Front, longitudinal |
| Engine displacement: | 5461 cm3 | 1897 cm3 | 4973 cm3 |
| Engine oil capacity: | 4 l | ||
| Fuel System: | Multi-point injection | Carburettor | Multi-point injection |
| Position of cylinders: | V engine | Inline | V engine |
| Valvetrain: | SOHC | DOHC | |
| Number of cylinders: | 8 | 4 | 8 |
| Number of valves per cylinder: | 2 | 4 | |
| Compression ratio: | 10.7 | 7.5 | 10 |
| Piston Stroke: | 83.6 mm | 85 mm | |
| Cylinder Bore: | 85 mm | 96.5 mm | |
| Wheel Drive: | All wheel drive (4x4) | Rear wheel drive | Rear wheel drive |
| Number of Gears (automatic transmission): | 7 | 4 | |
| Number of Gears (manual transmission): | 4 | ||
| Length: | 4922 mm | 4485 mm | 5065 mm |
| Width: | 1922 mm | 1740 mm | 1912 mm |
| Height: | 1674 mm | 1560 mm | 1445 mm |
| Wheelbase: | 2980 mm | 2650 mm | 2945 mm |
| Front track: | 1661 mm | 1430 mm | 1603 mm |
| Rear (Back) track: | 1651 mm | 1470 mm | 1576 mm |
| Front overhang: | 915 mm | ||
| Rear overhang: | 1205 mm | ||
| Minimum volume of Luggage (trunk): | 550 l | 520 l | |
| Maximum amount of Luggage (trunk): | 1950 l | ||
| Front suspension: | Helical spring | Double wishbone | |
| Rear suspension: | Helical spring | Multi-link independent | |
| Max weight: | 2840 kg | 1650 kg | 2600 kg |
| Front brakes: | Ventilated discs | Drum | Ventilated discs |
| Rear brakes: | Ventilated discs | Drum | Ventilated discs |
| Kerb Weight: | 2220 kg | 1200 kg | 2080 kg |
| ABS: | yes | yes | |
| Steering type: | Steering rack and pinion | Cone worm with recirculation balls | Steering rack and pinion |
| Power steering: | Hydraulic Steering | Hydraulic Steering | |
| Minimum turning circle (turning diameter): | 11.8 m | 11.89 m | |
| Tire size: | 255/55 R 19 W | 235/60 R16 | |
| Wheel rims size: | R19 | 7.5J x 16 |