Comparison Citroen SM 2.7 V6 (170 Hp) & Mercedes-Benz S-class (W221) S 500 (388 Hp) G-TRONIC
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| Brand: | Citroen | Mercedes-Benz |
| Model: | SM | S-class |
| Generation: | SM | S-class (W221) |
| Engine / modification: | 2.7 V6 (170 Hp) | S 500 (388 Hp) G-TRONIC |
| Production start: | 1970 year | 2005 year |
| Production end: | 1972 year | 2009 year |
| Coupe type: | Sedan | |
| Num. of Doors: | 3 | 4 |
| Num. of seats: | 4 | 5 |
| Fuel consumption / economy - urban: | 17.4-17.6 l/100 km | |
| Fuel consumption / economy - extra urban: | 8.5-8.7 l/100 km | |
| Fuel consumption / economy - combined: | 12.5 l/100 km | 11.7-11.9 l/100 km |
| Fuel Type: | Petrol (Gasoline) | Petrol (Gasoline) |
| Fuel tank volume: | 90 l | 90 l |
| CO2 emissions: | 279-283 g/km | |
| Power: | 170 hp | 388 hp |
| Max power in: | 5500 rpm. | 6000 rpm. |
| Maximum speed: | 220 km/h | 250 km/h |
| Acceleration from 0 to 100 km/h: | 8.9 sec | 5.4 sec |
| Torque: | 230 Nm @ 4000 rpm. | 530 Nm @ 2800 rpm. |
| Model Engine: | C 114-1 | M 273.961 |
| Engine position: | Front, longitudinal | Front, longitudinal |
| Engine displacement: | 2670 cm3 | 5461 cm3 |
| Engine oil capacity: | 7 l | 8.5 l |
| Coolant: | 13 l | 8.5 l |
| Fuel System: | Carburettor | Multi-point injection |
| Position of cylinders: | V engine | |
| Valvetrain: | DOHC | DOHC |
| Number of cylinders: | 6 | 8 |
| Number of valves per cylinder: | 2 | 4 |
| Compression ratio: | 9 | 10.7 |
| Piston Stroke: | 75 mm | 90.5 mm |
| Cylinder Bore: | 87 mm | 98 mm |
| Wheel Drive: | Front wheel drive | Rear wheel drive |
| Number of Gears (automatic transmission): | 7G-TRONIC | |
| Number of Gears (manual transmission): | 5 | |
| Length: | 4893 mm | 5079 mm |
| Width: | 1836 mm | 1872 mm |
| Width including mirrors: | 2115 mm | |
| Height: | 1324 mm | 1473 mm |
| Wheelbase: | 3035 mm | |
| Front track: | 1604 mm | |
| Rear (Back) track: | 1606 mm | |
| Ride height(clearance): | 155 mm | |
| Front overhang: | 871 mm | |
| Rear overhang: | 1173 mm | |
| Minimum volume of Luggage (trunk): | 560 l | |
| Front suspension: | Hydro-pneumatic element | Pneumatic elastic element |
| Rear suspension: | Hydro-pneumatic element | Pneumatic elastic element |
| Max weight: | 1800 kg | 2545 kg |
| Front brakes: | Ventilated discs | |
| Rear brakes: | Ventilated discs | |
| Kerb Weight: | 1450 kg | 1865 kg |
| ABS: | yes | |
| Steering type: | Steering rack and pinion | |
| Power steering: | Hydraulic Steering | |
| Tire size: | 195/70 R15 | 235/55 R17 |
| Wheel rims size: | 8J x 17 |