Comparison Mercedes-Benz S-class (W221) S 420 CDI (320 Hp) G-TRONIC & Mercedes-Benz S-class (W221) S 320 CDI (235 Hp) G-TRONIC
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| Brand: | Mercedes-Benz | Mercedes-Benz |
| Model: | S-class | S-class |
| Generation: | S-class (W221) | S-class (W221) |
| Engine / modification: | S 420 CDI (320 Hp) G-TRONIC | S 320 CDI (235 Hp) G-TRONIC |
| Production start: | 2006 year | 2006 year |
| Production end: | 2009 year | 2009 year |
| Coupe type: | Sedan | Sedan |
| Num. of Doors: | 4 | 4 |
| Num. of seats: | 5 | 5 |
| Fuel consumption / economy - urban: | 13.0-13.2 l/100 km | 11.6-11.8 l/100 km |
| Fuel consumption / economy - extra urban: | 7.2-7.4 l/100 km | 6.4-6.6 l/100 km |
| Fuel consumption / economy - combined: | 9.4-9.6 l/100 km | 8.3-8.5 l/100 km |
| Fuel Type: | Diesel | Diesel |
| Fuel tank volume: | 90 l | 90 l |
| Emission standard: | Euro 4 | |
| CO2 emissions: | 247-252 g/km | 220-225 g/km |
| Power: | 320 hp | 235 hp |
| Max power in: | 3600 rpm. | 3600 rpm. |
| Maximum speed: | 250 km/h | 250 km/h |
| Acceleration from 0 to 100 km/h: | 6.0 sec | 7.5 sec |
| Torque: | 730 Nm @ 2200 rpm. | 540 Nm @ 1600-2400 rpm. |
| Model Engine: | OM 629.91x | OM 642.930 |
| Engine position: | Front, longitudinal | Front, longitudinal |
| Engine displacement: | 3997 cm3 | 2987 cm3 |
| Engine oil capacity: | 10.5 l | 8.5 l |
| Coolant: | 9.0 l | 7.5 l |
| Fuel System: | Diesel Commonrail | Diesel Commonrail |
| Aspiration / Turbine: | Turbocharging | Turbocharging |
| Position of cylinders: | V engine | V engine |
| Valvetrain: | DOHC | DOHC |
| Number of cylinders: | 8 | 6 |
| Number of valves per cylinder: | 4 | 4 |
| Compression ratio: | 18 | 18 |
| Piston Stroke: | 86 mm | 92 mm |
| Cylinder Bore: | 86 mm | 83 mm |
| Wheel Drive: | Rear wheel drive | Rear wheel drive |
| Number of Gears (automatic transmission): | 7G-TRONIC | 7 |
| Length: | 5079 mm | 5079 mm |
| Width: | 1872 mm | 1871 mm |
| Width including mirrors: | 2115 mm | 2115 mm |
| Height: | 1473 mm | 1473 mm |
| Wheelbase: | 3035 mm | 3035 mm |
| Front track: | 1604 mm | 1604 mm |
| Rear (Back) track: | 1606 mm | 1606 mm |
| Front overhang: | 871 mm | 871 mm |
| Rear overhang: | 1173 mm | 1173 mm |
| Minimum volume of Luggage (trunk): | 560 l | 560 l |
| Front suspension: | Pneumatic elastic element | Pneumatic elastic element |
| Rear suspension: | Pneumatic elastic element | Pneumatic elastic element |
| Max weight: | 2640 kg | 2550 kg |
| Front brakes: | Ventilated discs | Ventilated discs |
| Rear brakes: | Disc | Disc |
| Kerb Weight: | 2015 kg | 1880 kg |
| ABS: | yes | yes |
| Steering type: | Steering rack and pinion | Steering rack and pinion |
| Minimum turning circle (turning diameter): | 11.8 m | 11.8 m |
| Tire size: | 235/55 R17 | 235/55 R17 |
| Wheel rims size: | 8J x 17 | 8J x 17 |