The BMW 6 Series Gran Coupe (F06 LCI), specifically the 640d variant with the Steptronic automatic transmission, was produced from 2015 to 2018. This model represents a facelift of the original F06 Gran Coupe, bringing updated styling, technology, and refinements to BMW’s four-door coupe offering. Positioned as a mid-to-high range trim within the 6 Series lineup, the 640d aimed to deliver a blend of performance, luxury, and efficiency, appealing to buyers seeking a sophisticated grand tourer. It sat above the 630d and 635d models, and below the more performance-focused 650i.
Technical Specifications
| Brand | BMW |
| Model | 6 Series |
| Generation | 6 Series Gran Coupe (F06 LCI, facelift 2015) |
| Type (Engine) | 640d (313 Hp) Steptronic |
| Start of production | 2015 |
| End of production | 2018 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Coupe |
| Seats | 5 |
| Doors | 4 |
| Fuel consumption (urban) | 6.2-6.6 l/100 km (37.9 – 35.6 US mpg, 45.6 – 42.8 UK mpg, 16.1 – 15.2 km/l) |
| Fuel consumption (extra urban) | 4.9-5.2 l/100 km (48 – 45.2 US mpg, 57.6 – 54.3 UK mpg, 20.4 – 19.2 km/l) |
| Fuel consumption (combined) | 5.4-5.7 l/100 km (43.6 – 41.3 US mpg, 52.3 – 49.6 UK mpg, 18.5 – 17.5 km/l) |
| CO2 emissions | 143-152 g/km |
| Fuel Type | Diesel |
| 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 | 5.8 kg/Hp, 172.9 Hp/tonne |
| Weight-to-torque ratio | 2.9 kg/Nm, 348.1 Nm/tonne |
| Power | 313 Hp @ 4400 rpm |
| Torque | 630 Nm @ 1500-2500 rpm (464.66 lb.-ft. @ 1500-2500 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | N57D30B |
| 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 | 8 l (8.45 US qt | 7.04 UK qt) |
| Kerb Weight | 1810 kg (3990.37 lbs.) |
| Max. weight | 2410 kg (5313.14 lbs.) |
| Max load | 600 kg (1322.77 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 6 Series Gran Coupe (F06) represented BMW’s foray into the four-door coupe segment, aiming to combine the elegance of a coupe with the practicality of a sedan. The LCI (Life Cycle Impulse) facelift introduced in 2015 brought subtle but significant changes to the exterior styling, interior refinement, and technology. The 640d, powered by BMW’s renowned diesel engine and paired with the Steptronic automatic transmission, was a key variant in the lineup, offering a compelling blend of performance and fuel efficiency. Built on the F06 platform, it shared its underpinnings with the 5 Series sedan, but distinguished itself with its unique body style and more luxurious appointments.
Powertrain & Engine Architecture
The heart of the 640d is BMW’s N57D30B inline-six diesel engine. This 3.0-liter engine utilizes a sophisticated common-rail direct injection system, delivering fuel at extremely high pressure for optimized combustion. The N57 engine is known for its robust construction and ability to handle significant power output. The 640d specifically produces 313 horsepower at 4400 rpm and a substantial 630 Nm (464.66 lb.-ft.) of torque between 1500 and 2500 rpm. This broad torque curve is a hallmark of the N57, providing strong acceleration in virtually any gear. The engine is equipped with a twin-power turbocharger system, featuring a variable geometry turbocharger and a smaller turbocharger, working in tandem to minimize turbo lag and maximize power delivery across the rev range. The Steptronic 8-speed automatic transmission is a crucial component of the powertrain. This transmission offers smooth and quick shifts, and features adaptive learning algorithms that adjust shift points based on driving style. It also includes paddle shifters for manual control.
Driving Characteristics
The 640d Steptronic delivers a refined and effortless driving experience. The abundant torque from the diesel engine provides strong acceleration, allowing for confident overtaking maneuvers. While not as overtly sporty as the gasoline-powered 650i, the 640d offers a more than adequate level of performance for most drivers. The Steptronic transmission contributes to the smooth driving experience, seamlessly shifting gears and minimizing disruptions to the flow of power. Compared to the manual transmission options available in other 6 Series models, the automatic prioritizes comfort and ease of use. The gear ratios are tuned for both acceleration and fuel efficiency, with taller gears for relaxed cruising on the highway. The 640d feels planted and stable on the road, thanks to its well-tuned suspension and rear-wheel-drive configuration.
Equipment & Trim Levels
The 640d Gran Coupe came standard with a generous array of features, including leather upholstery, power-adjustable seats with memory function, a premium sound system, and a navigation system. Interior trim options included various wood veneers and aluminum accents. Optional extras included features such as a head-up display, adaptive cruise control, a panoramic sunroof, and upgraded leather options. The standard dashboard configuration featured BMW’s iDrive infotainment system, controlled via a rotary dial and touchscreen. Exterior styling cues included distinctive BMW kidney grilles, sleek headlights, and a sloping roofline that defined the Gran Coupe silhouette.
Chassis & Braking
The 640d Gran Coupe utilizes a double wishbone front suspension and an independent multi-link rear suspension, providing a comfortable ride and precise handling. The suspension is tuned to balance comfort and control, offering a good compromise between sporty responsiveness and everyday usability. Braking duties are handled by disc brakes on all four wheels, providing ample stopping power. Anti-lock braking system (ABS) and electronic stability control (ESC) are standard features, enhancing safety and stability. The 640d’s weight distribution is optimized for balanced handling, contributing to its confident cornering ability.
Market Reception & Comparison
The 640d Gran Coupe was generally well-received by automotive critics, who praised its blend of performance, luxury, and fuel efficiency. It was often seen as a more sensible alternative to the 650i, offering comparable levels of comfort and refinement with significantly better fuel economy. Compared to the 630d and 635d models, the 640d offered a noticeable performance upgrade, making it a more appealing choice for drivers who prioritized power and acceleration. The diesel engine’s fuel economy was a major selling point, particularly in Europe, where diesel fuel is more prevalent and often less expensive than gasoline. However, some critics noted that the diesel engine’s sound was not as refined as that of the gasoline engines.
Legacy
The N57 engine family, including the N57D30B found in the 640d, has proven to be remarkably reliable over the long term, provided it receives regular maintenance. The Steptronic 8-speed automatic transmission is also known for its durability. On the used car market, the 640d Gran Coupe represents a compelling value proposition, offering a luxurious and well-equipped grand tourer at a more affordable price point than when new. However, potential buyers should be aware of the potential maintenance costs associated with a complex vehicle like the 6 Series, and should ensure that the car has been properly maintained throughout its life. The 640d remains a popular choice for those seeking a sophisticated and efficient long-distance cruiser.
