Comparison Infiniti QX50 I (facelift 2015) 3.7 V6 (325 Hp) AWD Automatic & Mercedes-Benz SLK (R171, facelift 2008) SLK 280 V6 (231 Hp) 7G-TRONIC
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| Brand: | Infiniti | Mercedes-Benz |
| Model: | QX50 | SLK |
| Generation: | QX50 I (facelift 2015) | SLK (R171, facelift 2008) |
| Engine / modification: | 3.7 V6 (325 Hp) AWD Automatic | SLK 280 V6 (231 Hp) 7G-TRONIC |
| Production start: | 2015 year | 2008 year |
| Production end: | 2016 year | 2009 year |
| Coupe type: | SUV | Roadster |
| Num. of Doors: | 5 | 2 |
| Num. of seats: | 5 | 2 |
| Fuel consumption / economy - urban: | 13.8 l/100 km | |
| Fuel consumption / economy - extra urban: | 9.8 l/100 km | |
| Fuel Type: | Petrol (Gasoline) | Petrol (Gasoline) |
| Drag coefficient: | 0.33 | 0.32 |
| Fuel tank volume: | 80 l | 70 l |
| Emission standard: | Euro 6 | Euro 4 |
| Power: | 325 hp | 231 hp |
| Max power in: | 7000 rpm. | 6000 rpm. |
| Maximum speed: | 225 km/h | 250 , Electronically limited km/h |
| Acceleration from 0 to 100 km/h: | 6.7 sec | 6.2 sec |
| Torque: | 267 Nm @ 5200 rpm. | 300 Nm @ 2500-5000 rpm. |
| Model Engine: | M 272.942 | |
| Engine position: | Front, longitudinal | Front, longitudinal |
| Engine displacement: | 3696 cm3 | 2996 cm3 |
| Engine oil capacity: | 8 l | |
| Coolant: | 7.1 l | |
| Fuel System: | Multi-point injection | |
| Position of cylinders: | V engine | |
| Valvetrain: | DOHC | |
| Number of cylinders: | 6 | 6 |
| Number of valves per cylinder: | 4 | 4 |
| Compression ratio: | 11 | 11.3 |
| Piston Stroke: | 86 mm | 82.1 mm |
| Cylinder Bore: | 95.5 mm | 88 mm |
| Wheel Drive: | All wheel drive (4x4) | Rear wheel drive |
| Number of Gears (automatic transmission): | 7 | 7 |
| Length: | 4745 mm | 4107 mm |
| Width: | 1800 mm | 1788 mm |
| Width including mirrors: | 2005 mm | |
| Height: | 1613 mm | 1296 mm |
| Wheelbase: | 2880 mm | 2430 mm |
| Front track: | 1535 mm | |
| Rear (Back) track: | 1550 mm | |
| Ride height(clearance): | 165 mm | |
| Minimum volume of Luggage (trunk): | 309 l | 208 l |
| Front suspension: | Double wishbone | |
| Rear suspension: | Independent, spring multi-link with stabilizer | |
| Max weight: | 2305 kg | 1770 kg |
| Front brakes: | Ventilated discs | Ventilated discs |
| Rear brakes: | Ventilated discs | Disc |
| Kerb Weight: | 1823 kg | 1400 kg |
| ABS: | yes | |
| Steering type: | Steering rack and pinion | Steering rack and pinion |
| Power steering: | Electric Steering | Hydraulic Steering |
| Max. roof load: | 50 kg | |
| Minimum turning circle (turning diameter): | 10.51 m | |
| Tire size: | 225/55 R18 | Front wheel tires: 205/55 R 16 |
| Wheel rims size: | R18 | Front wheel rims: 7 J x 16 |