Comparison Mercedes-Benz R-class (W251) R 300 CDI V6 (190 Hp) 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) | W188 I Roadster |
| Engine / modification: | R 300 CDI V6 (190 Hp) G-TRONIC | 300 S (150 Hp) |
| Production start: | 2009 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 - extra urban: | 13.8 l/100 km | |
| Fuel consumption / economy - combined: | 8.5 l/100 km | |
| Fuel Type: | Diesel | Petrol (Gasoline) |
| Fuel tank volume: | 80 l | 85 l |
| Emission standard: | Euro 5 | |
| CO2 emissions: | 224 g/km | |
| Power: | 190 hp | 150 hp |
| Max power in: | 3800 rpm. | 5000 rpm. |
| Maximum speed: | 210 km/h | 175 km/h |
| Acceleration from 0 to 100 km/h: | 9.7 sec | 15 sec |
| Torque: | 440 Nm @ 1400-2800 rpm. | 230 Nm @ 3800 rpm. |
| Model Engine: | OM 642.950 | M 188.920 |
| Engine position: | Front, longitudinal | Front, longitudinal |
| Engine displacement: | 2987 cm3 | 2996 cm3 |
| Engine oil capacity: | 8.5 l | 7.5 l |
| Coolant: | 10.1-13 l | 19.5 l |
| Fuel System: | Diesel Commonrail | Carburettor |
| Aspiration / Turbine: | Turbocharger / Intercooler | |
| Position of cylinders: | V engine | Inline |
| Valvetrain: | SOHC | |
| Number of cylinders: | 6 | 6 |
| Number of valves per cylinder: | 2 | |
| Compression ratio: | 15.5 | 7.8 |
| Piston Stroke: | 88 mm | |
| Cylinder Bore: | 85 mm | |
| Wheel Drive: | Rear wheel drive | Rear wheel drive |
| Number of Gears (automatic transmission): | 7G-TRONIC | |
| Number of Gears (manual transmission): | 4 | |
| Length: | 4922 mm | 4730 mm |
| Width: | 1922 mm | 1910 mm |
| Height: | 1674 mm | 1510 mm |
| Wheelbase: | 2980 mm | 2900 mm |
| Front track: | 1661 mm | 1480 mm |
| Rear (Back) track: | 1651 mm | 1525 mm |
| Minimum volume of Luggage (trunk): | 550 l | |
| Maximum amount of Luggage (trunk): | 1950 l | |
| Front suspension: | Double wishbone | |
| Rear suspension: | Independent, spring multi-link with stabilizer | Helical spring |
| Max weight: | 2840 kg | 2000 kg |
| Front brakes: | Ventilated discs | Drum |
| Rear brakes: | Disc | Drum |
| Kerb Weight: | 2195 kg | 1540 kg |
| ABS: | yes | |
| Steering type: | Steering rack and pinion | Cone worm with recirculation balls |
| Power steering: | Hydraulic Steering | |
| Minimum turning circle (turning diameter): | 11.8 m | 12.5 m |
| Permitted trailer load with brakes (12%): | 2100 kg | |
| Permitted trailer load without brakes: | 750 kg | |
| Tire size: | 235/65 R17 | |
| Wheel rims size: | R17 | 15 |