The BMW 6 Series Gran Turismo (G32) 640d xDrive Steptronic was a luxury grand tourer produced by BMW from 2017 to 2020. Positioned as a more practical and spacious alternative to the traditional 6 Series coupe and convertible, the Gran Turismo combined elements of a sedan, station wagon, and SUV. The 640d variant, equipped with a potent diesel engine and all-wheel drive, represented a mid-to-high trim level within the G32 lineup, appealing to buyers seeking performance, efficiency, and long-distance comfort. It was designed to compete with vehicles like the Audi A7 Sportback and Porsche Panamera.
Technical Specifications
| Brand | BMW |
| Model | 6 Series |
| Generation | 6 Series Gran Turismo (G32) |
| Type (Engine) | 640d (320 Hp) xDrive Steptronic |
| Start of production | 2017 |
| End of production | 2020 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Grand Tourer |
| Seats | 5 |
| Doors | 5 |
| Fuel consumption (urban) | 6.8-7.2 l/100 km (34.6 – 32.7 US mpg) |
| Fuel consumption (extra urban) | 5.2-5.6 l/100 km (45.2 – 42 US mpg) |
| Fuel consumption (combined) | 5.8-6.2 l/100 km (40.6 – 37.9 US mpg) |
| CO2 emissions | 153-163 g/km |
| Fuel Type | Diesel |
| Acceleration 0 – 100 km/h | 5.3 sec |
| Acceleration 0 – 62 mph | 5.3 sec |
| Acceleration 0 – 60 mph | 5 sec |
| Maximum speed | 250 km/h (155.34 mph) |
| Emission standard | Euro 6 |
| Weight-to-power ratio | 6 kg/Hp, 165.4 Hp/tonne |
| Weight-to-torque ratio | 2.8 kg/Nm, 351.4 Nm/tonne |
| Power | 320 Hp @ 4400 rpm |
| Torque | 680 Nm @ 1750-2250 rpm (501.54 lb.-ft. @ 1750-2250 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | B57D30B |
| Engine displacement | 2993 cm3 (182.64 cu. in.) |
| Number of cylinders | 6 |
| Engine configuration | Inline |
| Cylinder Bore | 84 mm (3.31 in.) |
| Piston Stroke | 90 mm (3.54 in.) |
| Compression ratio | 16.5:1 |
| Number of valves per cylinder | 4 |
| Fuel injection system | Diesel Commonrail |
| Engine aspiration | Twin-power turbo, Intercooler |
| Engine oil capacity | 6.5 l (6.87 US qt | 5.72 UK qt) |
| Coolant | 11.9 l (12.57 US qt | 10.47 UK qt) |
| Kerb Weight | 1935 kg (4265.94 lbs.) |
| Max. weight | 2615 kg (5765.09 lbs.) |
| Max load | 680 kg (1499.14 lbs.) |
| Trunk (boot) space – minimum | 610 l (21.54 cu. ft.) |
| Trunk (boot) space – maximum | 1800 l (63.57 cu. ft.) |
| Fuel tank capacity | 66 l (17.44 US gal | 14.52 UK gal) |
| Permitted trailer load with brakes (8%) | 2100 kg (4629.71 lbs.) |
| Permitted trailer load with brakes (12%) | 2100 kg (4629.71 lbs.) |
| Permitted trailer load without brakes | 750 kg (1653.47 lbs.) |
| Permitted towbar download | 100 kg (220.46 lbs.) |
| Length | 5091 mm (200.43 in.) |
| Width | 1902 mm (74.88 in.) |
| Width including mirrors | 2158 mm (84.96 in.) |
| Height | 1540 mm (60.63 in.) |
| Wheelbase | 3070 mm (120.87 in.) |
| Minimum turning circle | 12.5 m (41.01 ft.) |
| Drive wheel | All wheel drive (4×4) |
| Number of gears and type of gearbox | 8 gears, automatic transmission Steptronic |
| Front suspension | Double wishbone |
| Rear suspension | Independent multi-link suspension |
| Front brakes | Ventilated discs |
| Rear brakes | Ventilated discs |
| Assisting systems | ABS (Anti-lock braking system) |
| Steering type | Steering rack and pinion |
| Power steering | Electric Steering |
| Tires size | 225/60 R17 99Y |
| Wheel rims size | 7.5 J x 17 |
Powertrain & Engine Architecture
The heart of the 640d Gran Turismo is BMW’s B57D30B inline-six diesel engine. This 3.0-liter engine utilizes a sophisticated common-rail direct injection system, delivering fuel at extremely high pressures for optimized combustion. The engine is equipped with a twin-scroll turbocharger with variable geometry turbine (VGT) technology, along with intercooling, to maximize power and torque while minimizing turbo lag. The B57 engine family is known for its robust construction and ability to handle significant tuning. The 640d’s engine produces 320 horsepower at 4,400 rpm and a substantial 680 Nm (501.54 lb-ft) of torque between 1,750 and 2,250 rpm. This torque output provides strong acceleration and effortless cruising. The engine also features a particulate filter to reduce emissions, meeting Euro 6 standards. The engine is paired with BMW’s 8-speed Steptronic automatic transmission, which offers smooth and quick shifts. The xDrive all-wheel-drive system intelligently distributes power between the front and rear axles, enhancing traction and stability in all weather conditions.
Driving Characteristics
The 640d xDrive Steptronic delivers a refined and powerful driving experience. The abundant torque available from low engine speeds provides strong off-the-line acceleration and makes overtaking effortless. While not as overtly sporty as some of its gasoline-powered siblings, the 640d offers a confident and composed ride. The 8-speed automatic transmission is well-tuned, providing seamless gear changes and contributing to the car’s overall smoothness. The xDrive system ensures excellent grip and stability, particularly on slippery surfaces. Compared to the 630d, the 640d offers a noticeable performance increase. The higher output engine and slightly revised tuning provide a more engaging driving experience. Compared to the gasoline-powered 640i, the 640d prioritizes fuel efficiency and torque delivery over outright horsepower and engine responsiveness.
Equipment & Trim Levels
The 640d xDrive Steptronic typically came well-equipped as standard. Features included leather upholstery, power-adjustable front seats with memory function, a premium sound system, a large infotainment screen with iDrive controller, navigation, and a comprehensive suite of safety features such as automatic emergency braking, lane departure warning, and adaptive cruise control. Optional extras included upgraded leather trim, panoramic sunroof, head-up display, Bowers & Wilkins sound system, and various driver assistance packages. The Gran Turismo’s interior was designed to be spacious and comfortable, with a focus on rear passenger accommodation. The rear seats offered ample legroom and headroom, making the 640d a suitable choice for long journeys.
Chassis & Braking
The 6 Series Gran Turismo utilizes a sophisticated chassis design. The front suspension features a double wishbone setup, while the rear employs an independent multi-link suspension. This configuration provides a good balance between ride comfort and handling precision. The 640d was equipped with ventilated disc brakes on all four wheels, providing ample stopping power. The electronic stability control (ESC) system and ABS (Anti-lock Braking System) further enhance safety. The steering is electrically assisted, offering precise and responsive control.
Market Reception & Comparison
The BMW 6 Series Gran Turismo, and specifically the 640d variant, received mixed reviews from automotive critics. While praised for its spacious interior, comfortable ride, and efficient engine, some critics found the styling somewhat controversial. The 640d was generally considered a strong performer, offering a compelling combination of power, efficiency, and refinement. Fuel economy was a key strength, with the 640d achieving combined fuel consumption figures in the range of 5.8-6.2 l/100 km (40.6 – 37.9 US mpg). Compared to the 630d, the 640d offered a noticeable performance upgrade, justifying the higher price tag for those seeking more power. Compared to the 640i, the 640d appealed to buyers prioritizing fuel economy and torque over outright horsepower.
Legacy
The B57 engine family, including the B57D30B found in the 640d, has proven to be remarkably reliable. With proper maintenance, these engines are capable of high mileage. The 6 Series Gran Turismo, while not a massive sales success, offered a unique blend of practicality and luxury. On the used car market, the 640d xDrive Steptronic represents a good value proposition for buyers seeking a comfortable, efficient, and well-equipped grand tourer. Its robust engine and sophisticated drivetrain ensure that it remains a capable and enjoyable vehicle for years to come.
