Comparison Mercedes-Benz R-class (W251) R 280 V6 (231 Hp) G-TRONIC & GMC Sierra HD Regular Cab Long Box 3500 6.6 TD V8 (445 Hp) 4WD DRW Automatic & Mercedes-Benz R-class (W251) R 300 V6 (231 Hp) G-TRONIC
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| Brand: | Mercedes-Benz | GMC | Mercedes-Benz |
| Model: | R-class | Sierra 2500HD | R-class |
| Generation: | R-class (W251) | Sierra HD Regular Cab Long Box | R-class (W251) |
| Engine / modification: | R 280 V6 (231 Hp) G-TRONIC | 3500 6.6 TD V8 (445 Hp) 4WD DRW Automatic | R 300 V6 (231 Hp) G-TRONIC |
| Production start: | 2007 year | 2018 year | 2009 year |
| Production end: | 2009 year | 2014 year | |
| Coupe type: | Combi | Pick-up | Combi |
| Num. of Doors: | 5 | 2 | 5 |
| Num. of seats: | 5 | 2 | 5 |
| Fuel consumption / economy - urban: | 15.2-15.4 l/100 km | ||
| Fuel consumption / economy - extra urban: | 8.8-9.0 l/100 km | ||
| Fuel consumption / economy - combined: | 10.9 l/100 km | 11.1-11.3 l/100 km | |
| Fuel Type: | Petrol (Gasoline) | Diesel | Petrol (Gasoline) |
| Fuel tank volume: | 80 l | 136 l | 80 l |
| Emission standard: | Euro 5 | Euro 5 | |
| CO2 emissions: | 260 g/km | 260 g/km | |
| Power: | 231 hp | 445 hp | 231 hp |
| Max power in: | 6000 rpm. | 2800 rpm. | 6000 rpm. |
| Maximum speed: | 222 km/h | 222 km/h | |
| Acceleration from 0 to 100 km/h: | 9.6 sec | 9.7 sec | |
| Torque: | 300 Nm @ 2500-5000 rpm. | 1234 Nm @ 1600 rpm. | 300 Nm @ 2500-5000 rpm. |
| Model Engine: | M 272.945 | DURAMAX L5P | M 272.945 |
| Engine position: | Front, longitudinal | Front, longitudinal | Front, longitudinal |
| Engine displacement: | 2996 cm3 | 6588 cm3 | 2996 cm3 |
| Engine oil capacity: | 8 l | 9.5 l | 8 l |
| Coolant: | 10.1-13 l | 10.1-13 l | |
| Fuel System: | Multi-point injection | Diesel Commonrail | Multi-point injection |
| Aspiration / Turbine: | Turbocharger | ||
| Position of cylinders: | V engine | V engine | V engine |
| Number of cylinders: | 6 | 8 | 6 |
| Number of valves per cylinder: | 4 | ||
| Compression ratio: | 11.3 | 16 | 11.3 |
| Piston Stroke: | 99 mm | ||
| Cylinder Bore: | 103 mm | ||
| Wheel Drive: | Rear wheel drive | All wheel drive (4x4) | Rear wheel drive |
| Number of Gears (automatic transmission): | 7G-TRONIC | 6 | 7G-TRONIC |
| Length: | 4922 mm | 5700 mm | 4922 mm |
| Width: | 1922 mm | 1922 mm | |
| Width including mirrors: | 2035 mm | ||
| Height: | 1674 mm | 1963-1979 mm | 1674 mm |
| Wheelbase: | 2980 mm | 3393 mm | 2980 mm |
| Front track: | 1661 mm | 1661 mm | |
| Rear (Back) track: | 1651 mm | 1651 mm | |
| Minimum volume of Luggage (trunk): | 550 l | 550 l | |
| Maximum amount of Luggage (trunk): | 1950 l | 2160 l | 1950 l |
| Front suspension: | Double wishbone | Torsion | Double wishbone |
| Rear suspension: | Independent, spring multi-link with stabilizer | The spring | Independent, spring multi-link with stabilizer |
| Max weight: | 2790 kg | 5908 kg | 2790 kg |
| Front brakes: | Ventilated discs | Ventilated discs | Ventilated discs |
| Rear brakes: | Disc | Ventilated discs | Disc |
| Kerb Weight: | 2130 kg | 2130 kg | |
| ABS: | yes | yes | yes |
| Steering type: | Steering rack and pinion | Steering rack and pinion | Steering rack and pinion |
| Power steering: | Hydraulic Steering | Electric Steering | Hydraulic Steering |
| Minimum turning circle (turning diameter): | 11.8 m | 11.8 m | |
| Permitted trailer load with brakes (12%): | 2100 kg | 9072 kg | 2100 kg |
| Permitted trailer load without brakes: | 750 kg | 750 kg | |
| Tire size: | 255/55 R18 | 245/75 R17; 265/70 R17; 265/70 R18; 265/60 R20 | 255/55 R18 |
| Wheel rims size: | R18 | 7J x 17; 7.5J x 17; 8J x 18; 8J x 20 | R18 |