Comparison Mercedes-Benz S-class Long (W221) S 420 CDI (320 Hp) & BMW 5 Series Sedan (G30) M550d (400 Hp) xDrive Steptronic
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| Brand: | Mercedes-Benz | BMW |
| Model: | S-class | 5 Series |
| Generation: | S-class Long (W221) | 5 Series Sedan (G30) |
| Engine / modification: | S 420 CDI (320 Hp) | M550d (400 Hp) xDrive Steptronic |
| Production start: | 2006 year | 2017 year |
| Production end: | 2009 year | 2020 year |
| Coupe type: | Sedan | Sedan |
| Num. of Doors: | 4 | 4 |
| Num. of seats: | 5 | 5 |
| Fuel consumption / economy - urban: | 13.0 l/100 km | 6.6-6.9 l/100 km |
| Fuel consumption / economy - extra urban: | 7.2 l/100 km | 5.4-5.6 l/100 km |
| Fuel consumption / economy - combined: | 9.4 l/100 km | 5.9-6.1 l/100 km |
| Fuel Type: | Diesel | Diesel |
| Fuel tank volume: | 90 l | 66 l |
| Emission standard: | EURO IV | Euro 6 |
| CO2 emissions: | 154-159 g/km | |
| Power: | 320 hp | 400 hp |
| Max power in: | 3600 rpm. | 4400 rpm. |
| Maximum speed: | 250 km/h | 250 km/h |
| Acceleration from 0 to 100 km/h: | 6.0 sec | 4.4 sec |
| Torque: | 730 Nm/2200 rpm. | 760 Nm @ 2000-3000 rpm. |
| Model Engine: | B57D30C | |
| Engine position: | Front, longitudinal | Front, longitudinal |
| Engine displacement: | 3996 cm3 | 2993 cm3 |
| Engine oil capacity: | 6.5 l | |
| Fuel System: | Diesel Commonrail | Diesel Commonrail |
| Aspiration / Turbine: | Turbocharging | Twin-power turbo |
| Position of cylinders: | V engine | Inline |
| Valvetrain: | DOHC | DOHC |
| Number of cylinders: | 8 | 6 |
| Number of valves per cylinder: | 4 | 4 |
| Compression ratio: | 18 | 16 |
| Piston Stroke: | 86 mm | 90 mm |
| Cylinder Bore: | 86 mm | 84 mm |
| Wheel Drive: | Rear wheel drive | All wheel drive (4x4) |
| Number of Gears (automatic transmission): | 7 | 8 Steptronic |
| Length: | 5206 mm | 4962 mm |
| Width: | 1871 mm | 1868 mm |
| Width including mirrors: | 2126 mm | |
| Height: | 1473 mm | 1467 mm |
| Wheelbase: | 3165 mm | 2975 mm |
| Front track: | 1600 mm | |
| Rear (Back) track: | 1606 mm | |
| Minimum volume of Luggage (trunk): | 560 l | 530 l |
| Front suspension: | Pneumatic elastic element | |
| Rear suspension: | Pneumatic elastic element | |
| Max weight: | 2580 kg | 2470 kg |
| Front brakes: | Ventilated discs | Ventilated discs |
| Rear brakes: | Disc | Disc |
| Kerb Weight: | 2000 kg | 1845 kg |
| ABS: | yes | yes |
| Steering type: | Steering rack and pinion | Steering rack and pinion |
| Power steering: | Electric Steering | |
| Permitted trailer load with brakes (8%): | 2000 kg | |
| Permitted trailer load with brakes (12%): | 2000 kg | |
| Permitted trailer load without brakes: | 750 kg | |
| Permitted towbar download: | 90 kg | |
| Tire size: | 235/55 R17 | 245/40 R19 |
| Wheel rims size: | 8Jx17 | 8J x 19 |