The BMW 6 Series Gran Turismo (G32) facelift, specifically the 640i variant produced from 2020 to 2023, represents BMW’s attempt to blend the luxury and performance of the 6 Series with the practicality of a Gran Turismo body style. This iteration, designated as the G32 LCI (Life Cycle Impulse), received styling updates and powertrain refinements. The 640i, positioned as a mid-to-high range offering within the Gran Turismo lineup, featured a 3.0-liter inline-six engine with mild-hybrid technology, paired exclusively with an eight-speed Steptronic automatic transmission. It aimed to provide a comfortable, refined grand touring experience with a focus on efficiency and performance.
Technical Specifications
| Brand | BMW |
| Model | 6 Series |
| Generation | 6 Series Gran Turismo (G32 LCI, facelift 2020) |
| Type (Engine) | 640i (333 Hp) Mild Hybrid 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) | 8.7-8.9 l/100 km (27 – 26.4 US mpg) |
| Fuel consumption (extra urban) | 5.7-5.9 l/100 km (41.3 – 39.9 US mpg) |
| Fuel consumption (combined) | 6.8-7.0 l/100 km (34.6 – 33.6 US mpg) |
| CO2 emissions | 155-160 g/km |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 100 km/h | 5.5 sec |
| Acceleration 0 – 62 mph | 5.5 sec |
| Acceleration 0 – 60 mph | 5.2 sec |
| Maximum speed | 250 km/h (155.34 mph) |
| Emission standard | EURO 6d |
| Weight-to-power ratio | 5.6 kg/Hp |
| Weight-to-torque ratio | 4.1 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 | 6.9 l (7.29 US qt | 6.07 UK qt) |
| Kerb Weight | 1855 kg (4089.57 lbs.) |
| Max. weight | 2510 kg (5533.6 lbs.) |
| Max load | 655 kg (1444.03 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 | 1538 mm (60.55 in.) |
| Wheelbase | 3070 mm (120.87 in.) |
| Front track | 1615 mm (63.58 in.) |
| Rear track | 1649 mm (64.92 in.) |
| Ride height (ground clearance) | 138 mm (5.43 in.) |
| Drag coefficient (Cd) | 0.27 |
| Minimum turning circle | 12.3 m (40.35 ft.) |
| Drivetrain | Rear wheel drive |
| 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 |
INTRODUCTION
The BMW 6 Series Gran Turismo (G32) was introduced in 2017 as a more practical alternative to the traditional 6 Series coupe and convertible. The G32 LCI facelift, launched in 2020, brought updated styling, improved technology, and refined powertrains. The 640i, powered by the B58B30C engine, occupied a sweet spot in the range, offering a balance of performance and efficiency. It was positioned above the 630i and below the more potent M650i xDrive, targeting buyers who desired a luxurious and capable grand tourer without the full commitment to a high-performance model. Production of the G32 Gran Turismo concluded in 2023.
Powertrain & Engine Architecture
The heart of the 640i is BMW’s B58B30C 3.0-liter inline-six engine. This engine is a member of BMW’s modular engine family and features a single twin-scroll turbocharger, direct fuel injection, and BMW’s VALVETRONIC variable valve timing and lift system. The B58 engine is renowned for its smooth power delivery and responsiveness. The 640i incorporates a 48V mild-hybrid system, adding a small electric motor that provides a power boost during acceleration and enables smoother start-stop operation. This system contributes to improved fuel economy and reduced emissions. The engine is longitudinally mounted and sends power to the rear wheels via an eight-speed Steptronic automatic transmission. This transmission is known for its quick and seamless shifts, enhancing the driving experience. The transmission features adaptive shift programs that adjust to the driver’s style and road conditions.
Driving Characteristics
The 640i Gran Turismo delivers a refined and comfortable driving experience. The 333 horsepower and 450 Nm (331.9 lb-ft) of torque provide ample power for effortless cruising and confident overtaking. The mild-hybrid system provides a noticeable boost in low-end torque, improving responsiveness. While not as overtly sporty as the M650i, the 640i offers a satisfying level of performance. The eight-speed automatic transmission is well-tuned, providing smooth and timely shifts. The Gran Turismo’s long wheelbase and sophisticated suspension contribute to a comfortable ride, even on less-than-perfect road surfaces. The steering is precise and well-weighted, providing a connected feel to the road. Compared to the 630i, the 640i offers a significant performance upgrade, while remaining more accessible and fuel-efficient than the M650i.
Equipment & Trim Levels
The 640i Gran Turismo came standard with a comprehensive list 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, connectivity, and vehicle settings control. 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 emphasized luxury and comfort, with high-quality materials and a spacious cabin. The rear seats offered ample legroom and headroom, making the Gran Turismo a comfortable choice for long journeys.
Chassis & Braking
The 640i Gran Turismo features a double-wishbone front suspension and an independent multi-link rear suspension. This setup provides a good balance of ride comfort and handling precision. The suspension is tuned to prioritize comfort, but still offers a secure and controlled feel in corners. Ventilated disc brakes are fitted to all four wheels, providing ample stopping power. The braking system is assisted by ABS (Anti-lock Braking System), electronic brake-force distribution, and brake assist. The steering system is an electric power steering system, offering precise and responsive steering feel.
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, it was sometimes criticized for its styling and relatively high price. Compared to the 630i, the 640i offered a noticeable performance improvement, justifying the price premium for many buyers. The M650i xDrive, with its more powerful engine and all-wheel drive, appealed to those seeking ultimate performance, but at a significantly higher cost. Fuel economy figures for the 640i were respectable for a vehicle of its size and performance, averaging around 34.6-33.6 US mpg in combined driving.
Legacy
The BMW 6 Series Gran Turismo, and specifically the 640i variant, represents an interesting chapter in BMW’s history. While it didn’t achieve the same sales success as some of its more traditional 6 Series siblings, it offered a unique combination of luxury, practicality, and performance. The B58B30C engine has proven to be a reliable and durable powerplant, and the 640i Gran Turismo is likely to hold its value reasonably well in the used car market. Its mild-hybrid technology, while relatively basic by today’s standards, was a step towards greater fuel efficiency and reduced emissions. The G32 LCI 640i remains a compelling option for buyers seeking a comfortable and capable grand tourer with a touch of BMW refinement.
