The BMW 6 Series Gran Coupe (F06 LCI), specifically the 640i variant with the Steptronic automatic transmission, represents a compelling blend of luxury, performance, and technology within the BMW lineup. Produced from 2015 to 2018, this facelifted version of the F06 Gran Coupe aimed to refine the original model, offering enhanced aesthetics and updated features. Positioned as a mid-range offering within the 6 Series Gran Coupe family, the 640i served as a step up from the 630i and a more accessible alternative to the high-performance 650i. It competed with vehicles like the Audi A7, Mercedes-Benz CLS, and Porsche Panamera, targeting buyers seeking a stylish, four-door coupe with a premium driving experience.
Technical Specifications
| Brand | BMW |
| Model | 6 Series |
| Generation | 6 Series Gran Coupe (F06 LCI, facelift 2015) |
| Type (Engine) | 640i (320 Hp) Steptronic |
| Start of production | 2015 |
| End of production | 2018 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Coupe |
| Seats | 5 |
| Doors | 4 |
| Fuel consumption (economy) – urban | 10.4-10.9 l/100 km (22.6 – 21.6 US mpg, 27.2 – 25.9 UK mpg, 9.6 – 9.2 km/l) |
| Fuel consumption (economy) – extra urban | 5.8-6.0 l/100 km (40.6 – 39.2 US mpg, 48.7 – 47.1 UK mpg, 17.2 – 16.7 km/l) |
| Fuel consumption (economy) – combined | 7.5-7.8 l/100 km (31.4 – 30.2 US mpg, 37.7 – 36.2 UK mpg, 13.3 – 12.8 km/l) |
| CO2 emissions | 174-182 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 6 |
| Weight-to-power ratio | 5.5 kg/Hp, 182.9 Hp/tonne |
| Weight-to-torque ratio | 3.9 kg/Nm, 257.1 Nm/tonne |
| Power | 320 Hp @ 5800-6000 rpm |
| Power per litre | 107.4 Hp/l |
| Torque | 450 Nm @ 1300-4500 rpm (331.9 lb.-ft. @ 1300-4500 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | N55B30A |
| Engine displacement | 2979 cm3 (181.79 cu. in.) |
| Number of cylinders | 6 |
| Engine configuration | Inline |
| Cylinder Bore | 84 mm (3.31 in.) |
| Piston Stroke | 89.6 mm (3.53 in.) |
| Compression ratio | 10.2:1 |
| Number of valves per cylinder | 4 |
| Fuel injection system | Direct injection |
| Engine aspiration | Twin-power turbo, Intercooler |
| Engine oil capacity | 6.5 l (6.87 US qt | 5.72 UK qt) |
| Coolant | 9.3 l (9.83 US qt | 8.18 UK qt) |
| Kerb Weight | 1750 kg (3858.09 lbs.) |
| Max. weight | 2360 kg (5202.91 lbs.) |
| Max load | 610 kg (1344.82 lbs.) |
| Trunk (boot) space – minimum | 460 l (16.24 cu. ft.) |
| Trunk (boot) space – maximum | 1265 l (44.67 cu. ft.) |
| Fuel tank capacity | 70 l (18.49 US gal | 15.4 UK gal) |
| Max. roof load | 75 kg (165.35 lbs.) |
| Length | 5007 mm (197.13 in.) |
| Width | 1894 mm (74.57 in.) |
| Height | 1392 mm (54.8 in.) |
| Wheelbase | 2968 mm (116.85 in.) |
| Front track | 1600 mm (62.99 in.) |
| Rear (Back) track | 1665 mm (65.55 in.) |
| Ride height (ground clearance) | 126 mm (4.96 in.) |
| Drag coefficient (Cd) | 0.28 |
| Minimum turning circle (turning diameter) | 11.95 m (39.21 ft.) |
| Drivetrain Architecture | The Internal combustion engine (ICE) drives the rear wheels of the vehicle. |
| Drive wheel | Rear wheel drive |
| Number of gears and type of gearbox | 8 gears, automatic transmission Steptronic |
| Front suspension | Double wishbone |
| Rear suspension | Independent multi-link suspension |
| Front brakes | Disc |
| Rear brakes | Disc |
| Assisting systems | ABS (Anti-lock braking system) |
| Steering type | Steering rack and pinion |
| Power steering | Electric Steering |
| Tires size | 225/55 R17; 245/45 R18; 275/45 R18; 245/40 R19; 275/35 R19; 245/35 R20; 275/30 R20 |
| Wheel rims size | 8J x 17; 8J x 18; 9J x 18; 8.5J x 19; 9J x 19; 8.5J x 20; 9J x 20 |
INTRODUCTION
The BMW 640i Gran Coupe (F06 LCI) debuted in 2015 as part of a mid-cycle refresh for the F06 generation. Building upon the original Gran Coupe launched in 2012, the LCI (Life Cycle Impulse) brought subtle but significant changes to the exterior styling, interior technology, and engine efficiency. The 640i, powered by the N55B30A inline-six engine, occupied a sweet spot in the range, offering a substantial performance upgrade over the base 630i while remaining more accessible than the flagship 650i. It was designed to appeal to drivers who desired a luxurious and sporty four-door coupe without the outright expense of the top-tier model. The Steptronic 8-speed automatic transmission was a popular choice, providing smooth and efficient gear changes.
Powertrain & Engine Architecture
At the heart of the 640i lies the N55B30A 3.0-liter inline-six engine. This engine is a direct-injection, twin-turbocharged powerplant known for its responsiveness and smooth power delivery. The N55 engine utilizes Valvetronic technology, which allows for precise control of valve lift and timing, optimizing both performance and fuel efficiency. The twin-scroll turbochargers minimize turbo lag, providing strong torque across a wide rev range. The Steptronic 8-speed automatic transmission is a crucial component of the powertrain. It features a torque converter and allows for both fully automatic operation and manual gear selection via steering wheel-mounted paddles. The transmission’s programming is tuned for both comfort and performance, adapting to the driver’s style. Gear ratios are optimized to provide brisk acceleration and efficient cruising.
Driving Characteristics
The 640i Gran Coupe with the Steptronic transmission delivers a refined and engaging driving experience. While not as aggressively tuned as the 650i, the 320 horsepower and 331 lb-ft of torque provide ample power for both everyday driving and spirited performance. Acceleration from 0-60 mph takes approximately 5.1 seconds. The Steptronic transmission shifts smoothly and quickly, contributing to a seamless power delivery. In automatic mode, the transmission intelligently selects the appropriate gear based on driving conditions and throttle input. Manual mode allows the driver to take full control, providing a more connected and engaging experience. The Gran Coupe’s chassis is well-balanced, offering a comfortable ride without sacrificing handling precision. The steering is precise and well-weighted, providing good feedback to the driver.
Equipment & Trim Levels
The 640i Gran Coupe came standard with a generous array of features, including leather upholstery, power-adjustable front seats with memory function, a premium sound system, a navigation system, and a rearview camera. Optional extras included features like adaptive cruise control, a head-up display, ventilated front seats, and a Bang & Olufsen sound system. Interior trim options ranged from wood veneers to aluminum accents, allowing buyers to personalize the cabin to their taste. The LCI facelift brought updated interior trim options and improved infotainment system functionality. Standard exterior features included xenon headlights, LED taillights, and 18-inch alloy wheels. Larger wheel sizes and various styling packages were available as options.
Chassis & Braking
The 640i Gran Coupe features a sophisticated chassis designed to balance comfort and handling. The front suspension utilizes a double-wishbone design, while the rear suspension employs an independent multi-link setup. This configuration provides excellent wheel control and a smooth ride. The braking system consists of ventilated disc brakes on all four wheels, providing ample stopping power. Anti-lock braking system (ABS) and dynamic stability control (DSC) are standard features, enhancing safety and stability. The steering system is a rack-and-pinion design with electric power assistance, offering precise and responsive steering feel.
Market Reception & Comparison
The 640i Gran Coupe was generally well-received by automotive critics. It was praised for its stylish design, luxurious interior, and engaging driving dynamics. The N55 engine was lauded for its smooth power delivery and fuel efficiency. Compared to the 630i, the 640i offered a significant performance upgrade, making it a more compelling choice for drivers seeking a sportier experience. Compared to the 650i, the 640i provided a more affordable entry point into the 6 Series Gran Coupe range without sacrificing too much in terms of luxury or performance. Fuel economy figures were respectable for a vehicle in this class, averaging around 31 mpg combined.
Legacy
The BMW 640i Gran Coupe (F06 LCI) remains a desirable vehicle in the used car market. The N55 engine is known for its reliability, although regular maintenance is essential. Common issues include oil leaks and occasional turbocharger problems. The Steptronic transmission is generally reliable, but fluid changes should be performed according to the manufacturer’s recommendations. The 640i’s combination of style, performance, and luxury continues to appeal to buyers seeking a sophisticated and engaging grand tourer. Its relatively accessible price point compared to newer models makes it an attractive option for those looking for a premium driving experience without breaking the bank.
