Comparison Mercedes-Benz R-class (W251) Long R 500 V6 (388 Hp) 4MATIC G-TRONIC & Mercedes-Benz W188 I Roadster 300 S (150 Hp)
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| Brand: | Mercedes-Benz | Mercedes-Benz |
| Model: | R-class | W188 |
| Generation: | R-class (W251) Long | W188 I Roadster |
| Engine / modification: | R 500 V6 (388 Hp) 4MATIC G-TRONIC | 300 S (150 Hp) |
| Production start: | 2008 year | 1952 year |
| Production end: | 2010 year | 1955 year |
| Coupe type: | Combi | Roadster |
| Num. of Doors: | 5 | 2 |
| Num. of seats: | 5 | 4 |
| Fuel consumption / economy - urban: | 18.2-18.4 l/100 km | |
| Fuel consumption / economy - extra urban: | 9.8-10.0 l/100 km | 13.8 l/100 km |
| Fuel consumption / economy - combined: | 12.9-13.1 l/100 km | |
| Fuel Type: | Petrol (Gasoline) | Petrol (Gasoline) |
| Fuel tank volume: | 80 l | 85 l |
| Emission standard: | EURO V | |
| CO2 emissions: | 306 g/km | |
| Power: | 388 hp | 150 hp |
| Max power in: | 6000 rpm. | 5000 rpm. |
| Maximum speed: | 250 km/h | 175 km/h |
| Acceleration from 0 to 100 km/h: | 6.3 sec | 15 sec |
| Torque: | 530 Nm @ 2800-4800 rpm. | 230 Nm @ 3800 rpm. |
| Model Engine: | M 188.920 | |
| Engine position: | Front, longitudinal | Front, longitudinal |
| Engine displacement: | 5461 cm3 | 2996 cm3 |
| Engine oil capacity: | 7.5 l | |
| Coolant: | 19.5 l | |
| Fuel System: | Multi-point injection | Carburettor |
| Position of cylinders: | V engine | Inline |
| Valvetrain: | SOHC | |
| Number of cylinders: | 8 | 6 |
| Number of valves per cylinder: | 4 | 2 |
| Compression ratio: | 10.7 | 7.8 |
| Piston Stroke: | 90.5 mm | 88 mm |
| Cylinder Bore: | 98 mm | 85 mm |
| Wheel Drive: | All wheel drive (4x4) | Rear wheel drive |
| Number of Gears (automatic transmission): | 7G-TRONIC | |
| Number of Gears (manual transmission): | 4 | |
| Length: | 5157 mm | 4730 mm |
| Width: | 1922 mm | 1910 mm |
| Height: | 1674 mm | 1510 mm |
| Wheelbase: | 3215 mm | 2900 mm |
| Front track: | 1661 mm | 1480 mm |
| Rear (Back) track: | 1651 mm | 1525 mm |
| Maximum amount of Luggage (trunk): | 2385 l | |
| Front suspension: | Double wishbone | |
| Rear suspension: | Independent, spring multi-link with stabilizer | Helical spring |
| Max weight: | 2920 kg | 2000 kg |
| Front brakes: | Ventilated discs | Drum |
| Rear brakes: | Ventilated discs | Drum |
| Kerb Weight: | 2265 kg | 1540 kg |
| ABS: | yes | |
| Steering type: | Steering rack and pinion | Cone worm with recirculation balls |
| Power steering: | Hydraulic Steering | |
| Max. roof load: | 100 kg | |
| Minimum turning circle (turning diameter): | 12.4 m | 12.5 m |
| Permitted trailer load with brakes (12%): | 2100 kg | |
| Permitted trailer load without brakes: | 750 kg | |
| Tire size: | 255/55 R19 W | |
| Wheel rims size: | R19 | 15 |