Comparison Mercedes-Benz S-class (W221) S 420 CDI (320 Hp) G-TRONIC & Audi A6 Avant (C8) 35 TDI (163 Hp) MHEV S tronic
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| Brand: | Mercedes-Benz | Audi |
| Model: | S-class | A6 |
| Generation: | S-class (W221) | A6 Avant (C8) |
| Engine / modification: | S 420 CDI (320 Hp) G-TRONIC | 35 TDI (163 Hp) MHEV S tronic |
| Production start: | 2006 year | 2019 year |
| Production end: | 2009 year | |
| Coupe type: | Sedan | Combi |
| Num. of Doors: | 4 | 5 |
| Num. of seats: | 5 | 5 |
| Fuel consumption / economy - urban: | 13.0-13.2 l/100 km | 4.6-4.8 l/100 km |
| Fuel consumption / economy - extra urban: | 7.2-7.4 l/100 km | 3.8-4.3 l/100 km |
| Fuel consumption / economy - combined: | 9.4-9.6 l/100 km | 4.1-4.5 l/100 km |
| Fuel Type: | Diesel | Diesel |
| Drag coefficient: | 0.27 | |
| Fuel tank volume: | 90 l | 63 l |
| AdBlue tank: | 12 l | |
| Emission standard: | Euro 4 | Euro 6d - TEMP |
| CO2 emissions: | 247-252 g/km | 108-118 g/km |
| Power: | 320 hp | 163 hp |
| Max power in: | 3600 rpm. | 3250-4200 rpm. |
| Maximum speed: | 250 km/h | 219 km/h |
| Acceleration from 0 to 100 km/h: | 6.0 sec | 9.5 sec |
| Torque: | 730 Nm @ 2200 rpm. | 370 Nm @ 1500-3000 rpm. |
| Model Engine: | OM 629.91x | DEZB |
| Engine position: | Front, longitudinal | Front, longitudinal |
| Engine displacement: | 3997 cm3 | 1968 cm3 |
| Engine oil capacity: | 10.5 l | 5.5 l |
| Coolant: | 9.0 l | 12.6 l |
| Fuel System: | Diesel Commonrail | Diesel Commonrail |
| Aspiration / Turbine: | Turbocharging | Turbocharger / Intercooler |
| Position of cylinders: | V engine | Inline |
| Valvetrain: | DOHC | |
| Number of cylinders: | 8 | 4 |
| Number of valves per cylinder: | 4 | 4 |
| Compression ratio: | 18 | 16 |
| Piston Stroke: | 86 mm | 95.5 mm |
| Cylinder Bore: | 86 mm | 81 mm |
| Wheel Drive: | Rear wheel drive | Front wheel drive |
| Number of Gears (automatic transmission): | 7G-TRONIC | 7 S tronic |
| Length: | 5079 mm | 4939 mm |
| Width: | 1872 mm | 1886 mm |
| Width including mirrors: | 2115 mm | 2110 mm |
| Height: | 1473 mm | 1494 mm |
| Wheelbase: | 3035 mm | 2924 mm |
| Front track: | 1604 mm | 1630 mm |
| Rear (Back) track: | 1606 mm | 1617 mm |
| Front overhang: | 871 mm | 920 mm |
| Rear overhang: | 1173 mm | 1095 mm |
| Minimum volume of Luggage (trunk): | 560 l | 565 l |
| Front suspension: | Pneumatic elastic element | Multi-link suspension |
| Rear suspension: | Pneumatic elastic element | Multi-link independent |
| Max weight: | 2640 kg | 2330 kg |
| Front brakes: | Ventilated discs | Ventilated discs |
| Rear brakes: | Disc | Disc |
| Kerb Weight: | 2015 kg | 1710 kg |
| ABS: | yes | yes |
| Steering type: | Steering rack and pinion | Steering rack and pinion |
| Power steering: | Electric Steering | |
| Max. roof load: | 100 kg | |
| Permitted trailer load with brakes (8%): | 2000 kg | |
| Minimum turning circle (turning diameter): | 11.8 m | 12.1 m |
| Permitted trailer load with brakes (12%): | 2000 kg | |
| Permitted trailer load without brakes: | 750 kg | |
| Permitted towbar download: | 95 kg | |
| Tire size: | 235/55 R17 | 225/60 R 17 99 Y |
| Wheel rims size: | 8J x 17 | 7.5J x 17 |