Comparison GMC Sierra 2500HD III (GMT900) Extended Cab Long Box 6.6 Duramax TD V8 (365 Hp) Automatic & Mercedes-Benz R-class (W251) R 280 CDI V6 (190 Hp) 4MATIC G-TRONIC
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| Brand: | GMC | Mercedes-Benz |
| Model: | Sierra 2500HD | R-class |
| Generation: | Sierra 2500HD III (GMT900) Extended Cab Long Box | R-class (W251) |
| Engine / modification: | 6.6 Duramax TD V8 (365 Hp) Automatic | R 280 CDI V6 (190 Hp) 4MATIC G-TRONIC |
| Production start: | 2007 year | 2007 year |
| Production end: | 2010 year | 2009 year |
| Coupe type: | Pick-up | Combi |
| Powertrain Architecture: | Internal Combustion engine | |
| Num. of Doors: | 2 | 5 |
| Num. of seats: | 5 | 5 |
| Fuel consumption / economy - combined: | 9.3 l/100 km | |
| Fuel Type: | Diesel | Diesel |
| Fuel tank volume: | 129 l | 80 l |
| CO2 emissions: | 246 g/km | |
| Power: | 365 hp | 190 hp |
| Max power in: | 3200 rpm. | |
| Maximum speed: | 210 km/h | |
| Acceleration from 0 to 100 km/h: | 9.9 sec | |
| Torque: | 895 Nm @ 1600 rpm. | 440 Nm |
| Model Engine: | Duramax LMM | OM 642.950 |
| Engine position: | Front, longitudinal | |
| Engine displacement: | 6599 cm3 | 2987 cm3 |
| Engine oil capacity: | 9.5 l | 8.5 l |
| Coolant: | 24 l | 10.1-13 l |
| Fuel System: | Diesel Commonrail | |
| Maximum engine speed: | 3450 rpm. | |
| Aspiration / Turbine: | Turbocharger / Intercooler | |
| Position of cylinders: | V engine | |
| Valvetrain: | OHV | |
| Number of cylinders: | 8 | 6 |
| Number of valves per cylinder: | 4 | 4 |
| Compression ratio: | 16.8 | |
| Piston Stroke: | 99 mm | |
| Cylinder Bore: | 103 mm | |
| Wheel Drive: | Rear wheel drive | All wheel drive (4x4) |
| Number of Gears (automatic transmission): | 7G-TRONIC | |
| Length: | 6330 mm | 4922 mm |
| Width: | 1922 mm | |
| Width including mirrors: | 2436 mm | |
| Height: | 1930 mm | 1659 mm |
| Wheelbase: | 4001 mm | 2980 mm |
| Front track: | 1744 mm | |
| Rear (Back) track: | 1676 mm | |
| Ride height(clearance): | 243 mm | |
| Minimum volume of Luggage (trunk): | 550 l | |
| Maximum amount of Luggage (trunk): | 2138 l | 1950 l |
| Front suspension: | Independent torsion bar, double wishbone | Double wishbone |
| Rear suspension: | Independent, spring multi-link with stabilizer | |
| Max weight: | 4173 kg | 2840 kg |
| Front brakes: | Disc | |
| Rear brakes: | Disc | |
| Kerb Weight: | 2915 kg | 2250 kg |
| ABS: | yes | |
| Steering type: | Cone worm with recirculation balls | |
| Minimum turning circle (turning diameter): | 16 m | 11.8 m |
| Permitted trailer load with brakes (12%): | 5897 kg | 2100 kg |
| Permitted trailer load without brakes: | 750 kg | |
| Tire size: | 245/75 R16; 265/75 R17 | 235/65 R17 |
| Wheel rims size: | 6.5J x 16; 7.5J x 17 | R17 |