Comparison Mercedes-Benz S-class (W221) S 550 (388 Hp) G-TRONIC & GMC Sierra 2500HD IV (GMTK2XX) Crew Cab Standard Box 6.6 Duramax TD V8 (397 Hp) Automatic
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| Brand: | Mercedes-Benz | GMC |
| Model: | S-class | Sierra 2500HD |
| Generation: | S-class (W221) | Sierra 2500HD IV (GMTK2XX) Crew Cab Standard Box |
| Engine / modification: | S 550 (388 Hp) G-TRONIC | 6.6 Duramax TD V8 (397 Hp) Automatic |
| Production start: | 2005 year | 2015 year |
| Production end: | 2009 year | 2017 year |
| Coupe type: | Sedan | Pick-up |
| Powertrain Architecture: | Internal Combustion engine | |
| Num. of Doors: | 4 | 4 |
| Num. of seats: | 5 | 5 |
| Fuel consumption / economy - combined: | 11.7 l/100 km | |
| Fuel Type: | Petrol (Gasoline) | Diesel |
| Fuel tank volume: | 90 l | 136 l |
| Power: | 388 hp | 397 hp |
| Max power in: | 6000 rpm. | 3000 rpm. |
| Maximum speed: | 250 km/h | |
| Acceleration from 0 to 100 km/h: | 5.4 sec | |
| Torque: | 530 Nm @ 2800 rpm. | 1037 Nm @ 1600 rpm. |
| Model Engine: | M 273.96x | Duramax LML |
| Engine position: | Front, longitudinal | |
| Engine displacement: | 5461 cm3 | 6599 cm3 |
| Engine oil capacity: | 8.5 l | 9.5 l |
| Coolant: | 11.5 l | 22.4 l |
| Fuel System: | Multi-point injection | |
| Position of cylinders: | V engine | |
| Valvetrain: | DOHC | OHV |
| Number of cylinders: | 8 | 8 |
| Number of valves per cylinder: | 4 | 4 |
| Compression ratio: | 10.7 | 16 |
| Piston Stroke: | 90.5 mm | 99 mm |
| Cylinder Bore: | 98 mm | 103 mm |
| Wheel Drive: | Rear wheel drive | Rear wheel drive |
| Number of Gears (automatic transmission): | 7G-TRONIC | |
| Length: | 5079 mm | 6083 mm |
| Width: | 1872 mm | |
| Width including mirrors: | 2045 mm | |
| Height: | 1473 mm | 1988 mm |
| Wheelbase: | 3035 mm | 3904 mm |
| Front track: | 1604 mm | 1748 mm |
| Rear (Back) track: | 1606 mm | 1709 mm |
| Ride height(clearance): | 213 mm | |
| Minimum volume of Luggage (trunk): | 560 l | |
| Maximum amount of Luggage (trunk): | 1728 l | |
| Front suspension: | Pneumatic elastic element | |
| Rear suspension: | Pneumatic elastic element | |
| Max weight: | 2545 kg | 4309 kg |
| Front brakes: | Ventilated discs | |
| Rear brakes: | Ventilated discs | |
| Kerb Weight: | 1865 kg | 2831 kg |
| ABS: | yes | |
| Steering type: | Steering rack and pinion | Cone worm with recirculation balls |
| Power steering: | Electric Steering | |
| Minimum turning circle (turning diameter): | 15.7 m | |
| Permitted trailer load with brakes (12%): | 5897 kg | |
| Tire size: | 255/45 R18 | 245/75 R17; 265/70 R17; 265/70 R18; 265/60 R20 |
| Wheel rims size: | 8.5J x 18 | 7.5J x 17; 8J x 18; 8.5J x 20 |