Comparison Mercedes-Benz R-class (W251) Long R 500 V8 (306 Hp) 4MATIC G-TRONIC & Mercedes-Benz SLK (R172) SLK 350 (306 Hp) G-TRONIC
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| Brand: | Mercedes-Benz | Mercedes-Benz |
| Model: | R-class | SLK |
| Generation: | R-class (W251) Long | SLK (R172) |
| Engine / modification: | R 500 V8 (306 Hp) 4MATIC G-TRONIC | SLK 350 (306 Hp) G-TRONIC |
| Production start: | 2006 year | 2011 year |
| Production end: | 2008 year | 2015 year |
| Coupe type: | Combi | Cabriolet |
| Num. of Doors: | 5 | 2 |
| Num. of seats: | 5 | 2 |
| Fuel consumption / economy - urban: | 9.9 l/100 km | |
| Fuel consumption / economy - extra urban: | 5.5 l/100 km | |
| Fuel consumption / economy - combined: | 13.3 l/100 km | 7.1 l/100 km |
| Fuel Type: | Petrol (Gasoline) | Petrol (Gasoline) |
| Fuel tank volume: | 80 l | 60 l |
| Emission standard: | EURO V | Euro 5 |
| CO2 emissions: | 317 g/km | 167 g/km |
| Power: | 306 hp | 306 hp |
| Max power in: | 5600 rpm. | 6500 rpm. |
| Maximum speed: | 245 km/h | 250 km/h |
| Acceleration from 0 to 100 km/h: | 7 sec | 5.6 sec |
| Torque: | 460 Nm @ 2700-4750 rpm. | 370 Nm @ 3500-5250 rpm. |
| Engine position: | Front, longitudinal | Front, longitudinal |
| Engine displacement: | 4966 cm3 | 3498 cm3 |
| Fuel System: | Multi-point injection | Direct injection |
| Aspiration / Turbine: | Turbocharging | |
| Position of cylinders: | V engine | V engine |
| Number of cylinders: | 8 | 6 |
| Number of valves per cylinder: | 4 | |
| Compression ratio: | 10 | 12 |
| Piston Stroke: | 84 mm | |
| Cylinder Bore: | 97 mm | |
| Wheel Drive: | All wheel drive (4x4) | Rear wheel drive |
| Number of Gears (automatic transmission): | 7G-TRONIC | 7G-TRONIC PLUS |
| Length: | 5157 mm | 4134 mm |
| Width: | 1922 mm | 1810 mm |
| Height: | 1674 mm | 1301 mm |
| Wheelbase: | 3215 mm | 2430 mm |
| Front track: | 1661 mm | 1559 mm |
| Rear (Back) track: | 1651 mm | 1565 mm |
| Minimum volume of Luggage (trunk): | 225 l | |
| Maximum amount of Luggage (trunk): | 2385 l | 335 l |
| Front suspension: | Double wishbone | Independent multi-link |
| Rear suspension: | Independent, spring multi-link with stabilizer | Multi-link independent |
| Max weight: | 2895 kg | 1855 kg |
| Front brakes: | Ventilated discs | Ventilated discs |
| Rear brakes: | Ventilated discs | Disc |
| Kerb Weight: | 2240 kg | 1540 kg |
| ABS: | yes | yes |
| Steering type: | Steering rack and pinion | Steering rack and pinion |
| Power steering: | Hydraulic Steering | Electric Steering |
| Max. roof load: | 100 kg | |
| Minimum turning circle (turning diameter): | 12.4 m | 10.52 m |
| Permitted trailer load with brakes (12%): | 2100 kg | |
| Permitted trailer load without brakes: | 750 kg | |
| Tire size: | 255/55 R19 W | 225/45 R17 |
| Wheel rims size: | R19 | R17 |