Comparison Mercedes-Benz S-class Long (W221) S 420 CDI (320 Hp) & Mercedes-Benz A-class (W177) A 250 (224 Hp) DCT
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| Brand: | Mercedes-Benz | Mercedes-Benz |
| Model: | S-class | A-class |
| Generation: | S-class Long (W221) | A-class (W177) |
| Engine / modification: | S 420 CDI (320 Hp) | A 250 (224 Hp) DCT |
| Production start: | 2006 year | 2018 year |
| Production end: | 2009 year | |
| Coupe type: | Sedan | Hatchback |
| Num. of Doors: | 4 | 5 |
| Num. of seats: | 5 | 5 |
| Fuel consumption / economy - urban: | 13.0 l/100 km | 8.1-8.4 l/100 km |
| Fuel consumption / economy - extra urban: | 7.2 l/100 km | 5.1-5.4 l/100 km |
| Fuel consumption / economy - combined: | 9.4 l/100 km | 6.2-6.5 l/100 km |
| Fuel consumption at Low speed (WLTP): | 6.7 l/100 km | |
| Fuel Type: | Diesel | Petrol (Gasoline) |
| Fuel tank volume: | 90 l | 43 l |
| Fuel consumption at very high speed (WLTP): | 7.5 l/100 km | |
| Emission standard: | EURO IV | Euro 6 |
| CO2 emissions: | 141-149 g/km | |
| Power: | 320 hp | 224 hp |
| Max power in: | 3600 rpm. | 5500 rpm. |
| Maximum speed: | 250 km/h | 250 km/h |
| Acceleration from 0 to 100 km/h: | 6.0 sec | 6.2 sec |
| CO2 emissions (WLTP): | 152-170 g/km | |
| Torque: | 730 Nm/2200 rpm. | 350 Nm @ 1800 rpm. |
| Model Engine: | M 260.920 | |
| Engine position: | Front, longitudinal | Front, transverse |
| Engine displacement: | 3996 cm3 | 1991 cm3 |
| Engine oil capacity: | 5.5 l | |
| Fuel System: | Diesel Commonrail | Direct injection |
| Aspiration / Turbine: | Turbocharging | Turbocharger |
| Position of cylinders: | V engine | Inline |
| Valvetrain: | DOHC | |
| Number of cylinders: | 8 | 4 |
| Number of valves per cylinder: | 4 | 4 |
| Compression ratio: | 18 | |
| Piston Stroke: | 86 mm | |
| Cylinder Bore: | 86 mm | |
| Wheel Drive: | Rear wheel drive | Front wheel drive |
| Number of Gears (automatic transmission): | 7 | 7G-DCT |
| Length: | 5206 mm | 4419 mm |
| Width: | 1871 mm | 1796 mm |
| Width including mirrors: | 1992 mm | |
| Height: | 1473 mm | 1440 mm |
| Wheelbase: | 3165 mm | 2729 mm |
| Front track: | 1600 mm | 1567 mm |
| Rear (Back) track: | 1606 mm | 1547 mm |
| Ride height(clearance): | 104 mm | |
| Approach angle: | 13.4 ° | |
| Departure angle: | 17.2 ° | |
| Ramp angle: | 9.4 ° | |
| Front overhang: | 914 mm | |
| Rear overhang: | 776 mm | |
| Minimum volume of Luggage (trunk): | 560 l | |
| Maximum amount of Luggage (trunk): | 370 l | |
| Front suspension: | Pneumatic elastic element | |
| Rear suspension: | Pneumatic elastic element | |
| Max weight: | 2580 kg | 1965 kg |
| Front brakes: | Ventilated discs | Ventilated discs |
| Rear brakes: | Disc | Disc |
| Kerb Weight: | 2000 kg | 1380 kg |
| ABS: | yes | yes |
| Steering type: | Steering rack and pinion | Steering rack and pinion |
| Power steering: | Electric Steering | |
| Permitted trailer load with brakes (12%): | 1600 kg | |
| Permitted trailer load without brakes: | 725 kg | |
| Tire size: | 235/55 R17 | |
| Wheel rims size: | 8Jx17 |