Comparison Audi A8 (D4, 4H) 4.2 BiTDI V8 (350 Hp) quattro Tiptronic & BMW 6 Series Coupe (F13 LCI, facelift 2015) 650i (450 Hp) Steptronic & Audi A6 (4F,C6) 2.0 TFSI (170 Hp) Multitronic
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| Brand: | Audi | BMW | Audi |
| Model: | A8 | 6 Series | A6 |
| Generation: | A8 (D4, 4H) | 6 Series Coupe (F13 LCI, facelift 2015) | A6 (4F,C6) |
| Engine / modification: | 4.2 BiTDI V8 (350 Hp) quattro Tiptronic | 650i (450 Hp) Steptronic | 2.0 TFSI (170 Hp) Multitronic |
| Production start: | 2010 year | 2015 year | 2005 year |
| Production end: | 2011 year | 2018 year | 2008 year |
| Coupe type: | Sedan | Coupe | Sedan |
| Num. of Doors: | 4 | 2 | 4 |
| Num. of seats: | 5 | 4 | 5 |
| Fuel consumption / economy - urban: | 9.3 l/100 km | 11.9-12.3 l/100 km | 11.2 - 11.3 l/100 km |
| Fuel consumption / economy - extra urban: | 6.3 l/100 km | 6.6-6.8 l/100 km | 6.5 - 6.6 l/100 km |
| Fuel consumption / economy - combined: | 7.4 l/100 km | 8.6-8.8 l/100 km | 8.2 - 8.3 l/100 km |
| Fuel Type: | Diesel | Petrol (Gasoline) | Petrol (Gasoline) |
| Drag coefficient: | 0.27 | 0.30 | 0.29 |
| Fuel tank volume: | 90 l | 70 l | 70 l |
| Emission standard: | Euro 5 | EURO VI | Euro 4 |
| CO2 emissions: | 195 g/km | 199-206 g/km | 197 - 199 g/km |
| Power: | 350 hp | 450 hp | 170 hp |
| Max power in: | 4000 rpm. | 5500-6000 rpm. | 4300-6000 rpm. |
| Maximum speed: | 250 km/h | 250 km/h | 220 km/h |
| Acceleration from 0 to 100 km/h: | 5.5 sec | 4.6 sec | 8.7 sec |
| Torque: | 800 Nm @ 1750-2750 rpm. | 650 Nm @ 2000-4500 rpm. | 280 Nm @ 1800-4200 rpm. |
| Model Engine: | CDSB | BPJ, BYK | |
| Engine position: | Front, longitudinal | Front, longitudinal | Front, longitudinal |
| Engine displacement: | 4134 cm3 | 4395 cm3 | 1984 cm3 |
| Engine oil capacity: | 9.5 l | 9.0 l | 4.5 l |
| Coolant: | 12.2 l | 14.4 l | 9.7 l |
| Fuel System: | Diesel Commonrail | Direct injection | Direct injection |
| Aspiration / Turbine: | BiTurbo | Twin-power turbo | Turbocharging |
| Position of cylinders: | V engine | V engine | Inline |
| Valvetrain: | DOHC | DOHC | |
| Number of cylinders: | 8 | 8 | 4 |
| Number of valves per cylinder: | 4 | 4 | 4 |
| Compression ratio: | 16.5 | 10 | 10.3 |
| Piston Stroke: | 95.5 mm | 88.3 mm | 92.8 mm |
| Cylinder Bore: | 83 mm | 89 mm | 82.5 mm |
| Wheel Drive: | All wheel drive (4x4) | Rear wheel drive | Front wheel drive |
| Number of Gears (automatic transmission): | 8 | 8 Steptronic | Multitronic |
| Length: | 5137 mm | 4894 mm | 4916 mm |
| Width: | 1949 mm | 1894 mm | 1855 mm |
| Width including mirrors: | 2111 mm | ||
| Height: | 1460 mm | 1369 mm | 1459 mm |
| Wheelbase: | 2992 mm | 2855 mm | 2843 mm |
| Front track: | 1644 mm | 1600 mm | 1612 mm |
| Rear (Back) track: | 1635 mm | 1665 mm | 1618 mm |
| Ride height(clearance): | 120 mm | 124 mm | |
| Front overhang: | 1003 mm | ||
| Rear overhang: | 1142 mm | ||
| Minimum volume of Luggage (trunk): | 510 l | 460 l | |
| Maximum amount of Luggage (trunk): | 1142 l | 546 l | |
| Front suspension: | Multi-link suspension | Double wishbone | Independent multi-link |
| Rear suspension: | Independent on trapezoidal lever | Multi-link independent | Independent on trapezoidal lever |
| Max weight: | 2660 kg | 2310 kg | 2130 kg |
| Front brakes: | Ventilated discs | Disc | Ventilated discs |
| Rear brakes: | Ventilated discs | Disc | Disc |
| Kerb Weight: | 1995 kg | 1795 kg | 1550 kg |
| ABS: | yes | yes | yes |
| Steering type: | Steering rack and pinion | Steering rack and pinion | Steering rack and pinion |
| Power steering: | Electric Steering | Electric Steering | |
| Max. roof load: | 100 kg | 75 kg | 100 kg |
| Permitted trailer load with brakes (8%): | 2300 kg | 1700 kg | |
| Minimum turning circle (turning diameter): | 12.3 m | 11.7 m | 11.9 m |
| Permitted trailer load with brakes (12%): | 2300 kg | 1500 kg | |
| Permitted trailer load without brakes: | 750 kg | 750 kg | |
| Permitted towbar download: | 95 kg | 85 kg | |
| Tire size: | 235/60 R17 | 245/45 R18; 275/45 R18; 245/40 R19; 275/35 R19; 245/35 R20; 275/30 R20 | 205/60 R16 |
| Wheel rims size: | 8.0J x 17 | 8J x 18; 9J x 18; 8.5J x 19; 9J x 19; 8.5J x 20; 9J x 20 | 7J x 16 |