The BMW 6 Series Gran Coupe (F06 LCI), specifically the 640d xDrive Steptronic variant, was produced from 2015 to 2018 as part of the F06 facelift generation. This model represented BMW’s offering in the luxury four-door coupe segment, blending the styling of a coupe with the practicality of a sedan. The “LCI” (Life Cycle Impulse) designation signifies a mid-cycle refresh, bringing updated styling, technology, and engine options to the 6 Series range. The 640d xDrive Steptronic occupied a mid-to-upper position within the 6 Series lineup, offering a balance of performance, efficiency, and luxury features. It was positioned above the 630d and 635d models, and below the higher-performance 650i.
Technical Specifications
| Brand | BMW |
| Model | 6 Series |
| Generation | 6 Series Gran Coupe (F06 LCI, facelift 2015) |
| Type (Engine) | 640d (313 Hp) xDrive Steptronic |
| Start of production | 2015 |
| End of production | 2018 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Coupe |
| Seats | 5 |
| Doors | 4 |
| Fuel consumption (urban) | 6.5-6.8 l/100 km (36.2 – 34.6 US mpg) |
| Fuel consumption (extra urban) | 5.1-5.5 l/100 km (46.1 – 42.8 US mpg) |
| Fuel consumption (combined) | 5.6-6.0 l/100 km (42 – 39.2 US mpg) |
| CO2 emissions | 149-158 g/km |
| Fuel Type | Diesel |
| Acceleration 0 – 100 km/h | 5.2 sec |
| Acceleration 0 – 62 mph | 5.2 sec |
| Acceleration 0 – 60 mph | 4.9 sec |
| Maximum speed | 250 km/h (155.34 mph) |
| Emission standard | Euro 6 |
| Weight-to-power ratio | 6 kg/Hp, 167.4 Hp/tonne |
| Weight-to-torque ratio | 3 kg/Nm, 336.9 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 | 1870 kg (4122.64 lbs.) |
| Max. weight | 2470 kg (5445.42 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) | 0.29 |
| Minimum turning circle (turning diameter) | 11.95 m (39.21 ft.) |
| Drive wheel | All wheel drive (4×4) |
| 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 a significant expansion of the 6 Series lineup, introducing a four-door coupe body style to the traditionally two-door range. The F06 LCI, launched in 2015, brought with it a series of refinements, including updated exterior styling, interior enhancements, and improvements to the engine range. The 640d xDrive Steptronic, powered by the N57D30B engine, was a key variant, appealing to buyers seeking a blend of performance, efficiency, and all-weather capability. The xDrive all-wheel-drive system was a significant selling point, particularly in regions with inclement weather. This model aimed to provide a more practical alternative to the 650i while still delivering a luxurious and engaging driving experience.
Powertrain & Engine Architecture
The heart of the 640d xDrive Steptronic is BMW’s N57D30B 3.0-liter inline-six diesel engine. This engine is a highly refined unit, featuring common-rail direct injection, a variable geometry turbocharger, and an intercooler. The N57 engine family is known for its robust construction and ability to deliver high torque outputs. The N57D30B 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 provides strong acceleration in virtually any gear. The engine utilizes four valves per cylinder and a compression ratio of 16.5:1. The Steptronic 8-speed automatic transmission is a crucial component of the powertrain. This transmission is known for its smooth and quick shifts, and its ability to adapt to driving conditions. It features a torque converter and allows for both automatic and manual gear selection. The xDrive all-wheel-drive system distributes power between the front and rear axles as needed, enhancing traction and stability.
Driving Characteristics
The 640d xDrive Steptronic delivers a refined and confident driving experience. The abundant torque from the N57 engine provides effortless acceleration, making it well-suited for both highway cruising and overtaking maneuvers. While not as overtly sporty as the 650i, the 640d offers ample performance for most drivers. The 8-speed automatic transmission contributes to the smooth driving experience, seamlessly shifting gears and keeping the engine in its optimal power band. The xDrive all-wheel-drive system provides excellent grip in all conditions, inspiring confidence on wet or slippery roads. Compared to the 630d, the 640d offers a noticeable increase in power and torque, resulting in quicker acceleration and a more responsive feel. Compared to the 650i, the 640d prioritizes fuel efficiency and torque delivery over outright horsepower, making it a more practical choice for those who frequently cover long distances.
Equipment & Trim Levels
The 640d xDrive Steptronic came standard with a comprehensive list of luxury features. Standard equipment typically included leather upholstery, power-adjustable front seats with memory function, a premium sound system, a navigation system, and a rearview camera. Other standard features included automatic climate control, bi-xenon headlights, and 18-inch alloy wheels. Optional extras were plentiful, allowing buyers to customize their vehicle to their preferences. Popular options included upgraded leather upholstery, a head-up display, adaptive cruise control, a panoramic sunroof, and larger alloy wheels. Interior trim options included various wood veneers and aluminum accents. The dashboard layout was typical of BMW at the time, with a driver-focused design and intuitive controls.
Chassis & Braking
The 6 Series Gran Coupe featured a sophisticated chassis designed to deliver a balance of comfort and handling. The front suspension utilized a double wishbone design, while the rear suspension employed an independent multi-link setup. This configuration provided excellent ride quality and precise handling. The 640d xDrive Steptronic was equipped with disc brakes on all four wheels, providing ample stopping power. Anti-lock braking system (ABS) and electronic stability control (ESC) were standard features, enhancing safety. The steering system was a rack-and-pinion type with electric power assistance, offering precise and responsive steering feel. The xDrive all-wheel-drive system contributed to improved stability and traction, particularly during cornering and acceleration.
Market Reception & Comparison
The 640d xDrive Steptronic was generally well-received by automotive critics. It was praised for its refined engine, comfortable ride, and luxurious interior. The xDrive all-wheel-drive system was also highlighted as a significant benefit, particularly in regions with challenging weather conditions. Fuel economy was another strong point, with the 640d achieving respectable figures for a vehicle of its size and performance. Compared to the 630d, the 640d offered a noticeable performance upgrade, justifying the higher price tag for many buyers. Compared to the 650i, the 640d provided a more balanced combination of performance, efficiency, and practicality. Some critics noted that the 640d lacked the outright excitement of the 650i, but it offered a more sensible and versatile package overall.
Legacy
The N57 engine family, including the N57D30B found in the 640d, has proven to be remarkably reliable over the long term, provided it has been properly maintained. Regular oil changes and adherence to the manufacturer’s service schedule are crucial for ensuring longevity. The 8-speed Steptronic transmission is also known for its durability. In the used car market, the 640d xDrive Steptronic remains a desirable option for buyers seeking a luxurious and capable grand tourer. Its combination of performance, efficiency, and all-weather capability continues to appeal to a wide range of drivers. While maintenance costs can be higher than those of more mainstream vehicles, the 640d offers a rewarding ownership experience for those who appreciate its blend of luxury, performance, and refinement.
