Comparison Audi RS 6 (4B,C5) 4.2 BiTurbo V8 (450 Hp) quattro Tiptronic & Mercedes-Benz M-class (W164, facelift 2008) ML 420 CDI V8 (306 Hp) 4MATIC 7G-TRONIC
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| Brand: | Audi | Mercedes-Benz |
| Model: | RS 6 | M-class |
| Generation: | RS 6 (4B,C5) | M-class (W164, facelift 2008) |
| Engine / modification: | 4.2 BiTurbo V8 (450 Hp) quattro Tiptronic | ML 420 CDI V8 (306 Hp) 4MATIC 7G-TRONIC |
| Production start: | 2002 year | 2008 year |
| Production end: | 2006 year | 2009 year |
| Coupe type: | Sedan | SUV |
| Num. of Doors: | 4 | 5 |
| Num. of seats: | 5 | 5 |
| Fuel consumption / economy - urban: | 21.8 l/100 km | |
| Fuel consumption / economy - extra urban: | 10.4 l/100 km | |
| Fuel consumption / economy - combined: | 14.6 l/100 km | |
| Fuel Type: | Petrol (Gasoline) | Diesel |
| Drag coefficient: | 0.34 | 0.37 |
| Fuel tank volume: | 82 l | 95 l |
| Emission standard: | Euro 3 | Euro 4 |
| CO2 emissions: | 350 g/km | |
| Power: | 450 hp | 306 hp |
| Max power in: | 5700-6400 rpm. | 3600 rpm. |
| Maximum speed: | 250 km/h | 235 km/h |
| Acceleration from 0 to 100 km/h: | 4.9 sec | 6.8 sec |
| Acceleration from 0 to 200 km/h: | 17.6 sec | |
| Torque: | 560 Nm @ 1950-5500 rpm. | 700 Nm @ 2000-2600 rpm. |
| Model Engine: | BCY | OM 629.912 |
| Engine position: | Front, longitudinal | Front, longitudinal |
| Engine displacement: | 4172 cm3 | 3996 cm3 |
| Engine oil capacity: | 7.5 l | 12.5 l |
| Coolant: | 11 l | |
| Fuel System: | Multi-point injection | Diesel Commonrail |
| Aspiration / Turbine: | BiTurbo | |
| Position of cylinders: | V engine | |
| Valvetrain: | DOHC | DOHC |
| Number of cylinders: | 8 | 8 |
| Number of valves per cylinder: | 5 | 4 |
| Compression ratio: | 11 | 17 |
| Piston Stroke: | 93 mm | 86 mm |
| Cylinder Bore: | 84.5 mm | 86 mm |
| Wheel Drive: | All wheel drive (4x4) | All wheel drive (4x4) |
| Number of Gears (automatic transmission): | 5 Tiptronic | 7G-TRONIC |
| Length: | 4858 mm | 4781 mm |
| Width: | 1850 mm | 1911 mm |
| Width including mirrors: | 2124 mm | |
| Height: | 1387-1426 mm | 1815 mm |
| Wheelbase: | 2759 mm | 2915 mm |
| Front track: | 1578 mm | 1636 mm |
| Rear (Back) track: | 1587 mm | 1639 mm |
| Ride height(clearance): | 186-261 mm | |
| Approach angle: | 25 ° | |
| Departure angle: | 24 ° | |
| Ramp angle: | 14-21 ° | |
| Climb angle: | 45 ° | |
| Front overhang: | 866 mm | |
| Rear overhang: | 1000 mm | |
| Wading depth: | 500 mm | |
| Minimum volume of Luggage (trunk): | 424 l | 833 l |
| Maximum amount of Luggage (trunk): | 2050 l | |
| Front suspension: | Independent multi-link | |
| Rear suspension: | Double wishbone | |
| Max weight: | 2380 kg | 2950 kg |
| Front brakes: | Ventilated discs | Ventilated discs |
| Rear brakes: | Ventilated discs | Disc |
| Kerb Weight: | 1840 kg | 2240 kg |
| ABS: | yes | |
| Steering type: | Steering rack and pinion | |
| Power steering: | Hydraulic Steering | Electric Steering |
| Max. roof load: | 100 kg | 100 kg |
| Minimum turning circle (turning diameter): | 11.4 m | 11.6 m |
| Permitted trailer load with brakes (12%): | 3500 kg | |
| Permitted trailer load without brakes: | 750 kg | |
| Tire size: | 255/40 R18 | Front wheel tires: 255/50 R19; 265/45 R20; 265/40 R21 |
| Wheel rims size: | 8.5J x 18 | Front wheel rims: 8J x 19; 8.5J x 19; 8.5J x 20; 9J x 21 |