Technical Specifications
| Brand | BMW |
| Model | 6 Series |
| Generation | 6 Series Gran Turismo (G32 LCI, facelift 2020) |
| Type (Engine) | 640i (333 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) | 9.4-9.5 l/100 km (25 – 24.8 US mpg) |
| Fuel consumption (extra urban) | 6.0-6.2 l/100 km (39.2 – 37.9 US mpg) |
| Fuel consumption (combined) | 7.2-7.4 l/100 km (32.7 – 31.8 US mpg) |
| CO2 emissions | 166-170 g/km |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 100 km/h | 5.4 sec |
| Acceleration 0 – 62 mph | 5.4 sec |
| Acceleration 0 – 60 mph | 5.1 sec |
| Maximum speed | 250 km/h (155.34 mph) |
| Emission standard | EURO 6d |
| Weight-to-power ratio | 5.7 kg/Hp |
| Weight-to-torque ratio | 4.2 kg/Nm |
| Gross battery capacity | 0.528 kWh |
| Electric motor power | 11 Hp |
| Power | 333 Hp @ 5500-6250 rpm |
| Torque | 450 Nm @ 1600-4800 rpm (331.9 lb.-ft. @ 1600-4800 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | B58B30C |
| Engine displacement | 2998 cm3 (182.95 cu. in.) |
| Number of cylinders | 6 |
| Engine configuration | Inline |
| Cylinder Bore | 82 mm (3.23 in.) |
| Piston Stroke | 94.6 mm (3.72 in.) |
| Compression ratio | 11:1 |
| Number of valves per cylinder | 4 |
| Fuel injection system | Direct injection |
| Engine aspiration | Twin-power turbo, Intercooler |
| Valvetrain | VALVETRONIC |
| Engine oil capacity | 6.5 l (6.87 US qt | 5.72 UK qt) |
| Coolant capacity | 6.9 l (7.29 US qt | 6.07 UK qt) |
| Kerb Weight | 1910 kg (4210.83 lbs.) |
| Max. weight | 2575 kg (5676.9 lbs.) |
| Max load | 665 kg (1466.07 lbs.) |
| Trunk (boot) space – minimum | 600 l (21.19 cu. ft.) |
| Trunk (boot) space – maximum | 1800 l (63.57 cu. ft.) |
| Fuel tank capacity | 68 l (17.96 US gal | 14.96 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 |
| Number of gears | 8 |
| Gearbox type | Automatic Steptronic |
| Front suspension | Double wishbone |
| Rear suspension | Independent multi-link |
| Front brakes | Ventilated discs |
| Rear brakes | Ventilated discs |
| Steering type | Steering rack and pinion |
| Power steering | Electric |
| Tires size | 245/50 R18 100Y |
| Wheel rims size | 8J x 18 |
The BMW 6 Series Gran Turismo (G32) was introduced in 2017 as a replacement for the 5 Series Gran Turismo, aiming to provide a more luxurious and dynamically engaging experience. The 2020 facelift (LCI) brought updated styling, enhanced technology, and crucially, the introduction of mild-hybrid powertrains across the range. The 640i, powered by the B58B30C engine, occupied a sweet spot in the lineup, offering a compelling blend of performance, refinement, and fuel efficiency. It was marketed towards buyers seeking a comfortable and capable grand tourer with a premium feel.
Powertrain & Engine Architecture
At the heart of the 640i lies BMW’s B58B30C 3.0-liter inline-six engine. This engine is a masterpiece of modern engineering, featuring a single twin-scroll turbocharger, direct fuel injection, and BMW’s VALVETRONIC variable valve timing and lift system. The B58 is renowned for its smooth power delivery and responsiveness. The ‘C’ designation indicates the inclusion of a 48V mild-hybrid system. This system utilizes a 48V starter-generator, which adds up to 11 horsepower and assists during acceleration, enabling features like coasting with the engine switched off. The engine produces 333 hp at 5500-6250 rpm and 450 Nm (331.9 lb-ft) of torque between 1600-4800 rpm. This power is channeled through an eight-speed Steptronic automatic transmission, known for its quick and seamless shifts. The transmission is paired with BMW’s xDrive all-wheel-drive system, providing excellent traction and stability in all weather conditions.
Driving Characteristics
The 640i’s driving experience is characterized by its effortless performance and refined ride quality. The mild-hybrid system provides a noticeable boost in responsiveness, particularly during initial acceleration. The eight-speed automatic transmission is well-tuned, offering smooth and precise gear changes. While not as overtly sporty as some of BMW’s other models, the 640i provides ample power for comfortable highway cruising and spirited driving. Compared to the 630i, the 640i offers a significant performance advantage, with a noticeably quicker acceleration time of 5.1 seconds for 0-60 mph. Compared to potential higher-performance variants (had they been offered on the G32), the 640i prioritizes comfort and usability over outright track performance.
Equipment & Trim Levels
The 640i came standard with a generous array of features, including leather upholstery, power-adjustable front seats with memory function, a panoramic sunroof, and a premium sound system. BMW’s iDrive infotainment system with a 12.3-inch touchscreen display was also standard, offering navigation, Apple CarPlay, and Android Auto compatibility. Optional extras included upgraded leather trim, ventilated front seats, a head-up display, and advanced driver-assistance systems such as adaptive cruise control and lane-keeping assist. The interior design was focused on luxury and comfort, with high-quality materials and a spacious cabin.
Chassis & Braking
The 640i 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, but still offers good body control in corners. Ventilated disc brakes are fitted to 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. The steering is precise and well-weighted, providing a confident feel on the road.
Market Reception & Comparison
The 6 Series Gran Turismo, including the 640i variant, received mixed reviews from automotive critics. While praised for its spacious interior, comfortable ride, and refined powertrain, some critics found the styling somewhat awkward and the overall driving experience less engaging than other BMW models. Compared to the 630i, the 640i offered a significant performance upgrade and was considered the more desirable choice for drivers who prioritized power and responsiveness. Fuel economy was generally considered good for a vehicle of its size and performance, with combined figures ranging from 32.7 to 31.8 US mpg.
Legacy
The BMW 6 Series Gran Turismo was discontinued in 2023, with BMW shifting its focus towards more traditional sedan and SUV models. The B58 engine, however, continues to be highly regarded for its reliability and performance and is found in numerous other BMW models. The 640i, with its mild-hybrid powertrain, represents a transitional step in BMW’s electrification strategy. On the used car market, the G32 640i offers a compelling value proposition for buyers seeking a luxurious and capable grand tourer with a proven powertrain. Its combination of performance, comfort, and technology makes it a desirable option for those looking for a refined and versatile vehicle.
