Comparison Audi A6 Avant (4A,C4) 2.5 TDI (140 Hp) Automatic & BMW 6 Series Gran Coupe (F06) 640i (320 Hp) xDrive Steptronic & Alfa Romeo Stelvio 2.2 JTDM (190 Hp) AWD Automatic & Audi S4 Cabriolet (8E,B7) 4.2i V8 40V (344 Hp) quattro
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| Brand: | Audi | BMW | Alfa Romeo | Audi |
| Model: | A6 | 6 Series | Stelvio | S4 |
| Generation: | A6 Avant (4A,C4) | 6 Series Gran Coupe (F06) | Stelvio | S4 Cabriolet (8E,B7) |
| Engine / modification: | 2.5 TDI (140 Hp) Automatic | 640i (320 Hp) xDrive Steptronic | 2.2 JTDM (190 Hp) AWD Automatic | 4.2i V8 40V (344 Hp) quattro |
| Production start: | 1994 year | 2013 year | 2018 year | 2004 year |
| Production end: | 1997 year | 2015 year | 2008 year | |
| Coupe type: | Combi | Coupe | Cabriolet | |
| Num. of Doors: | 5 | 4 | 5 | 2 |
| Num. of seats: | 5 | 4 | 5 | 4 |
| Fuel consumption / economy - urban: | 10.3 l/100 km | 11.1-11.3 l/100 km | 6.5-6.9 l/100 km | 19.9 - 20.0 l/100 km |
| Fuel consumption / economy - extra urban: | 5.9 l/100 km | 6.4-6.6 l/100 km | 5.2-5.6 l/100 km | 10.3 - 10.4 l/100 km |
| Fuel consumption / economy - combined: | 7.6 l/100 km | 8.1-8.3 l/100 km | 5.7-6.1 l/100 km | 13.8 - 13.9 l/100 km |
| Fuel Type: | Diesel | Petrol (Gasoline) | Diesel | Petrol (Gasoline) |
| Drag coefficient: | 0.34 | 0.32 | 0.31 | |
| Fuel tank volume: | 80 l | 70 l | 58 l | 63 l |
| AdBlue tank: | 16.1 l | |||
| Emission standard: | Euro 5 | Euro 6d - TEMP | Euro 4 | |
| CO2 emissions: | 189-193 g/km | 149-160 g/km | 331-334 g/km | |
| Power: | 140 hp | 320 hp | 190 hp | 344 hp |
| Max power in: | 4000 rpm. | 5800-6000 rpm. | 3500 rpm. | 7000 rpm. |
| Maximum speed: | 200 km/h | 250 km/h | 210 km/h | 250 km/h |
| Acceleration from 0 to 100 km/h: | 11.4 sec | 5.3 sec | 7.6 sec | 5.9 sec |
| Torque: | 290 Nm @ 1900 rpm. | 450 Nm @ 1300-4500 rpm. | 450 Nm @ 1750 rpm. | 410 Nm @ 3500 rpm. |
| Model Engine: | AEL | N55B30 | BBK | |
| Engine position: | Front, longitudinal | Front, longitudinal | Front, longitudinal | Front, longitudinal |
| Engine displacement: | 2461 cm3 | 2979 cm3 | 2143 cm3 | 4163 cm3 |
| Engine oil capacity: | 5.0 l | 6.5 l | 9.0 l | |
| Coolant: | 6.5 l | 10.2 l | 12.2 l | |
| Fuel System: | Diesel - Standard diesel injection (SDI) | Direct injection | Diesel Commonrail | Multi-point injection |
| Aspiration / Turbine: | Turbo / Intercooler (Turbocharging / Intercooler) | Twin-power turbo | Turbocharger / Intercooler | |
| Position of cylinders: | Inline | Inline | Inline | V engine |
| Valvetrain: | OHC | DOHC | ||
| Number of cylinders: | 5 | 6 | 4 | 8 |
| Number of valves per cylinder: | 2 | 4 | 4 | 5 |
| Compression ratio: | 20 | 10.2 | 15.5 | 11 |
| Piston Stroke: | 95.5 mm | 89.6 mm | 99 mm | 92.8 mm |
| Cylinder Bore: | 81 mm | 84 mm | 83 mm | 84.5 mm |
| Wheel Drive: | Front wheel drive | All wheel drive (4x4) | All wheel drive (4x4) | All wheel drive (4x4) |
| Number of Gears (automatic transmission): | 4 | 8 Steptronic | 8 | |
| Number of Gears (manual transmission): | 6 | |||
| Length: | 4797 mm | 5007 mm | 4686 mm | 4573 mm |
| Width: | 1783 mm | 1894 mm | 1903 mm | 1777 mm |
| Width including mirrors: | 2163 mm | |||
| Height: | 1440 mm | 1392 mm | 1693 mm | 1391 mm |
| Wheelbase: | 2687 mm | 2968 mm | 2818 mm | 2650 mm |
| Front track: | 1520 mm | 1600 mm | 1522 mm | |
| Rear (Back) track: | 1524 mm | 1665 mm | 1518 mm | |
| Ride height(clearance): | 126 mm | |||
| Front overhang: | 860 mm | |||
| Rear overhang: | 1008 mm | |||
| Minimum volume of Luggage (trunk): | 390 l | 460 l | 246 l | |
| Maximum amount of Luggage (trunk): | 1310 l | 1265 l | 315 l | |
| Front suspension: | Independent, Spring McPherson, with stabilizer | Double wishbone | Independent multi-link | |
| Rear suspension: | Semi-independent, spring | Multi-link independent | Independent on trapezoidal lever | |
| Max weight: | 2090 kg | 2430 kg | 2315 kg | |
| Front brakes: | Ventilated discs | Ventilated discs | Ventilated discs | Ventilated discs |
| Rear brakes: | Disc | Ventilated discs | Disc | Ventilated discs |
| Kerb Weight: | 1540 kg | 1825 kg | 1745 kg | 1855 kg |
| ABS: | yes | yes | yes | yes |
| Steering type: | Steering rack and pinion | Steering rack and pinion | Steering rack and pinion | Steering rack and pinion |
| Power steering: | Hydraulic Steering | Electric Steering | Electric Steering | Hydraulic Steering |
| Max. roof load: | 100 kg | 75 kg | ||
| Permitted trailer load with brakes (8%): | 1650 kg | |||
| Minimum turning circle (turning diameter): | 11.4 m | 11.95 m | 11.5 m | |
| Permitted trailer load with brakes (12%): | 1450 kg | 2300 kg | ||
| Permitted trailer load without brakes: | 750 kg | 750 kg | ||
| Permitted towbar download: | 50 kg | |||
| Tire size: | 195/65 R15 | 225/55 R17; 245/45 R18; 245/40 R19; 275/35 R19; 245/35 R20; 275/30 R20 | 235/40 R18 | |
| Wheel rims size: | 6J x 15 | 8J x 17; 8J x 18; 8.5J x 19; 9J x 19; 8.5J x 20; 9J x 20 | 8J x 18 |