The BMW 6 Series Gran Turismo (G32) facelift, specifically the 640d variant introduced in 2020, represents a blend of luxury, performance, and practicality within BMW’s grand touring lineup. Positioned as a premium offering, this model year (produced through 2023) aimed to provide a more spacious and versatile alternative to the traditional 6 Series coupe and convertible. The “LCI” (Life Cycle Impulse) facelift brought styling updates, enhanced technology, and refined powertrain options, including the 640d with its mild-hybrid system. This variant occupied a mid-to-high range position within the G32 lineup, offering a balance between fuel efficiency and strong performance.
Technical Specifications
| Brand | BMW |
| Model | 6 Series |
| Generation | 6 Series Gran Turismo (G32 LCI, facelift 2020) |
| Type (Engine) | 640d (340 Hp) Mild Hybrid xDrive Steptronic |
| Start of production | 2020 |
| End of production | 2023 |
| Powertrain Architecture | MHEV (Mild Hybrid Electric Vehicle) |
| Body type | Grand Tourer |
| Seats | 5 |
| Doors | 5 |
| Fuel consumption (urban) | 6.7-6.9 l/100 km (35.1 – 34.1 US mpg) |
| Fuel consumption (extra urban) | 4.6-4.8 l/100 km (51.1 – 49 US mpg) |
| Fuel consumption (combined) | 5.4-5.6 l/100 km (43.6 – 42 US mpg) |
| CO2 emissions | 141-147 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 (Calculated) |
| Maximum speed | 250 km/h (155.34 mph) |
| Emission standard | EURO 6d |
| Weight-to-power ratio | 5.9 kg/Hp |
| Weight-to-torque ratio | 2.9 kg/Nm |
| Gross battery capacity | 0.528 kWh |
| Electric motor power | 11 Hp |
| Power | 340 Hp @ 4400 rpm |
| Torque | 700 Nm @ 1750-2250 rpm (516.29 lb.-ft.) |
| 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 | 7 l (7.4 US qt | 6.16 UK qt) |
| Kerb Weight | 2010 kg (4431.29 lbs.) |
| Max. weight | 2685 kg (5919.41 lbs.) |
| Max load | 675 kg (1488.12 lbs.) |
| Trunk (boot) space – minimum | 600 l (21.19 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) |
| Max. roof load | 75 kg (165.35 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.) |
| Height | 1540 mm (60.63 in.) |
| Wheelbase | 3070 mm (120.87 in.) |
| Front track | 1615 mm (63.58 in.) |
| Rear track | 1647 mm (64.84 in.) |
| Ride height (ground clearance) | 138 mm (5.43 in.) |
| Drag coefficient (Cd) | 0.27 |
| Minimum turning circle | 12.5 m (41.01 ft.) |
| Drivetrain Architecture | ICE and electric motor, All wheel drive |
| Drive wheel | All wheel drive (4×4) |
| Number of gears | 8 |
| Gearbox type | Automatic transmission Steptronic |
| Front suspension | Double wishbone |
| Rear suspension | Independent multi-link suspension |
| Front brakes | Ventilated discs |
| Rear brakes | Ventilated discs |
| Assisting systems | ABS |
| Steering type | Steering rack and pinion |
| Power steering | Electric |
| Tires size | 245/50 R18 100Y |
| Wheel rims size | 8J x 18 |
Powertrain & Engine Architecture
At the heart of the 640d Gran Turismo lies the BMW B57D30B, a 3.0-liter inline-six diesel engine. This engine is a member of the modular BMW engine family, known for its robust construction and efficiency. The B57 utilizes a sophisticated diesel commonrail fuel injection system, delivering precise fuel metering for optimal combustion. A twin-turbocharger setup, incorporating both a low-pressure and a high-pressure turbo, provides broad torque delivery across the rev range. The addition of an intercooler further enhances performance by cooling the intake air. The “D30B” designation indicates a specific output level and emissions configuration. This engine is paired with an 8-speed Steptronic automatic transmission, known for its smooth shifts and responsiveness. The mild-hybrid system, a 48V setup, adds a small electric motor that assists the engine during acceleration and allows for extended coasting with the engine off, improving fuel economy.
Driving Characteristics
The 640d Gran Turismo offers a refined and comfortable driving experience. The 700 Nm (516 lb-ft) of torque, available from 1750-2250 rpm, provides strong acceleration in everyday driving situations. While not as overtly sporty as some of BMW’s other models, the 640d delivers 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. Compared to the 630d or lower-powered variants, the 640d offers noticeably more performance, particularly during overtaking maneuvers. The mild-hybrid system contributes to a subtle but noticeable improvement in responsiveness. Compared to the gasoline-powered 640i, the 640d prioritizes fuel efficiency and torque delivery over outright horsepower.
Equipment & Trim Levels
The 640d Gran Turismo typically came well-equipped as standard. Features included leather upholstery, power-adjustable front seats with memory function, a premium sound system, and BMW’s iDrive infotainment system with a large touchscreen display. Standard safety features included automatic emergency braking, lane departure warning, and adaptive cruise control. Optional extras included upgraded leather trim, a panoramic sunroof, ventilated front seats, and a head-up display. The Gran Turismo’s spacious interior and large trunk (600-1800 liters) were key selling points, offering ample room for passengers and luggage.
Chassis & Braking
The G32 Gran Turismo features a double-wishbone front suspension and an independent multi-link rear suspension, providing a comfortable and controlled ride. The suspension is tuned to prioritize comfort over outright sportiness, but still offers good handling characteristics. The 640d typically came equipped with ventilated disc brakes on all four wheels, providing ample stopping power. The xDrive all-wheel-drive system distributes power between the front and rear axles as needed, enhancing traction and stability in all weather conditions.
Market Reception & Comparison
The BMW 6 Series Gran Turismo, and the 640d variant specifically, received mixed reviews. Critics praised its spaciousness, comfortable ride, and fuel efficiency. However, some found its styling unconventional and its driving dynamics less engaging than those of traditional BMW coupes. Compared to the 630d, the 640d offered a significant performance upgrade, justifying its higher price tag for buyers prioritizing power. Against competitors like the Audi A7 Sportback and Mercedes-Benz CLS, the 6 Series Gran Turismo offered a unique blend of practicality and luxury.
Legacy
The B57 engine family, including the B57D30B found in the 640d, has proven to be remarkably reliable. With proper maintenance, these engines can accumulate high mileage without major issues. The mild-hybrid system, while relatively simple, has also demonstrated good durability. On the used car market, the 640d Gran Turismo represents a good value proposition for buyers seeking a spacious, comfortable, and fuel-efficient luxury grand tourer. However, potential buyers should be aware of the cost of maintaining a complex vehicle like this, and ensure that all scheduled maintenance has been performed.
