Comparison Mercedes-Benz S-class (W221, facelift 2009) S 450 CDI V8 (320 Hp) G-TRONIC & Audi Q7 (Typ 4M) 3.0 TDI V6 (249 Hp) quattro Tiptronic 7 Seat
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| Brand: | Mercedes-Benz | Audi |
| Model: | S-class | Q7 |
| Generation: | S-class (W221, facelift 2009) | Q7 (Typ 4M) |
| Engine / modification: | S 450 CDI V8 (320 Hp) G-TRONIC | 3.0 TDI V6 (249 Hp) quattro Tiptronic 7 Seat |
| Production start: | 2009 year | 2015 year |
| Production end: | 2010 year | 2018 year |
| Coupe type: | Sedan | SUV |
| Num. of Doors: | 4 | 5 |
| Num. of seats: | 5 | 7 |
| Fuel consumption / economy - urban: | 13-13.2 l/100 km | 7.3 l/100 km |
| Fuel consumption / economy - extra urban: | 6.9-7.1 l/100 km | 5.7 l/100 km |
| Fuel consumption / economy - combined: | 9.1-9.3 l/100 km | 6.3 l/100 km |
| Fuel Type: | Diesel | Diesel |
| Fuel tank volume: | 90 l | 75 l |
| CO2 emissions: | 240-245 g/km | |
| Power: | 320 hp | 249 hp |
| Max power in: | 3600 rpm. | 2910-4500 rpm. |
| Maximum speed: | 250 km/h | 225 km/h |
| Acceleration from 0 to 100 km/h: | 6.6 sec | 6.9 sec |
| Torque: | 730 Nm @ 2200 rpm. | 600 Nm @ 1500-2910 rpm. |
| Model Engine: | OM 629.911 | CVMB |
| Engine position: | Front, longitudinal | Front, longitudinal |
| Engine displacement: | 3996 cm3 | 2967 cm3 |
| Engine oil capacity: | 10.5 l | 6.1 l |
| Fuel System: | Diesel Commonrail | Diesel Commonrail |
| Aspiration / Turbine: | Turbocharger / Intercooler | Turbocharger / Intercooler |
| Position of cylinders: | V engine | V engine |
| Valvetrain: | DOHC | |
| Number of cylinders: | 8 | 6 |
| Number of valves per cylinder: | 4 | |
| Compression ratio: | 17 | 16 |
| Piston Stroke: | 91.4 mm | |
| Cylinder Bore: | 83 mm | |
| Wheel Drive: | Rear wheel drive | All wheel drive (4x4) |
| Number of Gears (automatic transmission): | 7G-TRONIC | 8 tiptronic |
| Length: | 5096 mm | 5052 mm |
| Width: | 1871 mm | 1968 mm |
| Width including mirrors: | 2120 mm | 2212 mm |
| Height: | 1479 mm | 1741 mm |
| Wheelbase: | 3035 mm | 2994 mm |
| Front track: | 1600 mm | 1679 mm |
| Rear (Back) track: | 1606 mm | 1691 mm |
| Front overhang: | 888 mm | 978 mm |
| Rear overhang: | 1173 mm | 1080 mm |
| Minimum volume of Luggage (trunk): | 560 l | 770 l |
| Maximum amount of Luggage (trunk): | 1955 l | |
| Front suspension: | Independent multi-link | |
| Rear suspension: | Multi-link independent | |
| Max weight: | 2690 kg | 2750 kg |
| Front brakes: | Disc | Ventilated discs |
| Rear brakes: | Disc | Ventilated discs |
| Kerb Weight: | 2015 kg | 1980 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%): | 3500 kg | |
| Minimum turning circle (turning diameter): | 11.8 m | 12.4 m |
| Permitted trailer load with brakes (12%): | 3500 kg | |
| Permitted trailer load without brakes: | 750 kg | |
| Permitted towbar download: | 140 kg | |
| Tire size: | 255/45 R18 | 255/60 R18 |
| Wheel rims size: | R18 | 8.0J x 18 |