Comparison Mercedes-Benz R-class (W251) Long R 350 V6 (272 Hp) 4MATIC G-TRONIC & Mercedes-Benz SLK (R171) SLK 350 V6 (272 Hp) 7G-TRONIC
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| Brand: | Mercedes-Benz | Mercedes-Benz |
| Model: | R-class | SLK |
| Generation: | R-class (W251) Long | SLK (R171) |
| Engine / modification: | R 350 V6 (272 Hp) 4MATIC G-TRONIC | SLK 350 V6 (272 Hp) 7G-TRONIC |
| Production start: | 2006 year | 2004 year |
| Production end: | 2010 year | 2007 year |
| Coupe type: | Combi | Roadster |
| Num. of Doors: | 5 | 2 |
| Num. of seats: | 5 | 2 |
| Fuel consumption / economy - combined: | 11.7 l/100 km | |
| Fuel Type: | Petrol (Gasoline) | Petrol (Gasoline) |
| Drag coefficient: | 0.32 | |
| Fuel tank volume: | 80 l | 70 l |
| Emission standard: | EURO V | Euro 4 |
| CO2 emissions: | 274 g/km | |
| Power: | 272 hp | 272 hp |
| Max power in: | 6000 rpm. | 6000 rpm. |
| Maximum speed: | 230 km/h | 250 , Electronically limited km/h |
| Acceleration from 0 to 100 km/h: | 8.4 sec | 5.5 sec |
| Torque: | 350 Nm @ 2400-5000 rpm. | 350 Nm @ 2400-5000 rpm. |
| Model Engine: | M 272.963 | |
| Engine position: | Front, longitudinal | Front, longitudinal |
| Engine displacement: | 3498 cm3 | 3498 cm3 |
| Engine oil capacity: | 8 l | |
| Coolant: | 10.2 l | |
| Fuel System: | Multi-point injection | |
| Position of cylinders: | V engine | |
| Valvetrain: | DOHC | |
| Number of cylinders: | 6 | 6 |
| Number of valves per cylinder: | 4 | |
| Compression ratio: | 10.7 | 10.7 |
| Piston Stroke: | 86 mm | 86 mm |
| Cylinder Bore: | 92.9 mm | 92.9 mm |
| Wheel Drive: | All wheel drive (4x4) | Rear wheel drive |
| Number of Gears (automatic transmission): | 7 | 7 |
| Length: | 5157 mm | 4089 mm |
| Width: | 1922 mm | 1788 mm |
| Width including mirrors: | 1970 mm | |
| Height: | 1674 mm | 1298 mm |
| Wheelbase: | 3215 mm | 2430 mm |
| Front track: | 1661 mm | 1526 mm |
| Rear (Back) track: | 1651 mm | 1549 mm |
| Minimum volume of Luggage (trunk): | 208 l | |
| Maximum amount of Luggage (trunk): | 3215 l | |
| Front suspension: | Double wishbone | |
| Rear suspension: | Independent, spring multi-link with stabilizer | |
| Max weight: | 2880 kg | 1780 kg |
| Front brakes: | Ventilated discs | Ventilated discs |
| Rear brakes: | Disc | Disc |
| Kerb Weight: | 2230 kg | 1390 kg |
| ABS: | yes | |
| Steering type: | Steering rack and pinion | Steering rack and pinion |
| Power steering: | Hydraulic Steering | Hydraulic Steering |
| Max. roof load: | 100 kg | 50 kg |
| Minimum turning circle (turning diameter): | 12.4 m | 10.51 m |
| Permitted trailer load with brakes (12%): | 2100 kg | |
| Permitted trailer load without brakes: | 750 kg | |
| Tire size: | 235/65 R17 | Front wheel tires: 225/45 R 17 91 W |
| Wheel rims size: | R17 | Front wheel rims: 7.5 J x 17 H 2 |