Comparison Audi A8 Long (D5, facelift 2021) 50 TDI V6 (286 Hp) MHEV quattro tiptronic & GMC Sierra 2500HD IV (GMTK2XX) Crew Cab Long Box 6.6 Duramax TD V8 (397 Hp) 4WD Automatic
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| Brand: | Audi | GMC |
| Model: | A8 | Sierra 2500HD |
| Generation: | A8 Long (D5, facelift 2021) | Sierra 2500HD IV (GMTK2XX) Crew Cab Long Box |
| Engine / modification: | 50 TDI V6 (286 Hp) MHEV quattro tiptronic | 6.6 Duramax TD V8 (397 Hp) 4WD Automatic |
| Production start: | 2021 year | 2015 year |
| Production end: | 2017 year | |
| Coupe type: | Sedan | Pick-up |
| Powertrain Architecture: | Internal Combustion engine | |
| Num. of Doors: | 4 | 4 |
| Num. of seats: | 5 | 5 |
| Fuel Type: | Diesel | Diesel |
| Drag coefficient: | 0.26 | |
| Fuel tank volume: | 82 l | 136 l |
| AdBlue tank: | 24 l | |
| Combined fuel consumption (WLTP): | 7-7.7 l/100 km | |
| Emission standard: | Euro 6d-ISC-FCM | |
| Power: | 286 hp | 397 hp |
| Max power in: | 3500-4000 rpm. | 3000 rpm. |
| Maximum speed: | 250 , Electronically limited km/h | |
| Acceleration from 0 to 100 km/h: | 5.9 sec | |
| CO2 emissions (WLTP): | 184-202 g/km | |
| Torque: | 600 Nm @ 1750-3250 rpm. | 1037 Nm @ 1600 rpm. |
| Model Engine: | DMGK | Duramax LML |
| Engine position: | Front, longitudinal | |
| Engine displacement: | 2967 cm3 | 6599 cm3 |
| Engine oil capacity: | 6.1 l | 9.5 l |
| Coolant: | 14 l | 22.4 l |
| Fuel System: | Diesel Commonrail | |
| Position of cylinders: | V engine | |
| Valvetrain: | DOHC | OHV |
| Number of cylinders: | 6 | 8 |
| Number of valves per cylinder: | 4 | 4 |
| Compression ratio: | 16.3 | 16 |
| Piston Stroke: | 91.4 mm | 99 mm |
| Cylinder Bore: | 83 mm | 103 mm |
| Wheel Drive: | All wheel drive (4x4) | All wheel drive (4x4) |
| Number of Gears (automatic transmission): | 8 tiptronic | |
| Length: | 5320 mm | 6563 mm |
| Width: | 1945 mm | |
| Width including mirrors: | 2130 mm | 2045 mm |
| Height: | 1488 mm | 1980 mm |
| Wheelbase: | 3128 mm | 4258 mm |
| Front track: | 1645 mm | 1748 mm |
| Rear (Back) track: | 1633 mm | 1709 mm |
| Ride height(clearance): | 208 mm | |
| Approach angle: | 11 ° | |
| Departure angle: | 15 ° | |
| Front overhang: | 1007 mm | |
| Rear overhang: | 1185 mm | |
| Minimum volume of Luggage (trunk): | 505 l | |
| Maximum amount of Luggage (trunk): | 2162 l | |
| Max weight: | 2710 kg | 4536 kg |
| Front brakes: | Ventilated discs | |
| Rear brakes: | Ventilated discs | |
| Kerb Weight: | 2045 kg | 3425 kg |
| Steering type: | Cone worm with recirculation balls | |
| Power steering: | Electric Steering | |
| Max. roof load: | 75 kg | |
| Permitted trailer load with brakes (8%): | 2300 kg | |
| Minimum turning circle (turning diameter): | 12.9 m | 17.1 m |
| Permitted trailer load with brakes (12%): | 2300 kg | 6577 kg |
| Permitted trailer load without brakes: | 750 kg | |
| Permitted towbar download: | 95 kg | |
| Tire size: | 235/55 R18; 255/45 R19; 265/40 R20; 265/35 R21 | 245/75 R17; 265/70 R17; 265/70 R18; 265/60 R20 |
| Wheel rims size: | 8J x 18; 9J x 19; 9J x 20; 9J x 21 | 7.5J x 17; 8J x 18; 8.5J x 20 |