The BMW 6 Series Coupe (F13 LCI), specifically the 640d variant with the Steptronic automatic transmission, represents a refined and powerful iteration of BMW’s grand touring coupe. Produced from 2015 to 2018, this facelifted version of the F13 generation aimed to enhance both aesthetics and technology while maintaining the model’s core characteristics of luxury, performance, and driver engagement. The 640d occupied a middle ground within the 6 Series lineup, offering a compelling blend of efficiency and substantial power, appealing to buyers seeking a sophisticated and capable grand tourer.
Technical Specifications
| Brand | BMW |
| Model | 6 Series |
| Generation | 6 Series Coupe (F13 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 | 4 |
| Doors | 2 |
| Fuel consumption (urban) | 6.0-6.3 l/100 km (39.2 – 37.3 US mpg, 47.1 – 44.8 UK mpg, 16.7 – 15.9 km/l) |
| Fuel consumption (extra urban) | 4.8-5.1 l/100 km (49 – 46.1 US mpg, 58.9 – 55.4 UK mpg, 20.8 – 19.6 km/l) |
| Fuel consumption (combined) | 5.2-5.5 l/100 km (45.2 – 42.8 US mpg, 54.3 – 51.4 UK mpg, 19.2 – 18.2 km/l) |
| CO2 emissions | 139-147 g/km |
| Fuel Type | Diesel |
| Acceleration 0 – 100 km/h | 5.3 sec |
| Acceleration 0 – 62 mph | 5.3 sec |
| Acceleration 0 – 60 mph | 5 sec (Calculated) |
| Maximum speed | 250 km/h (155.34 mph) |
| Emission standard | Euro 6 |
| Weight-to-power ratio | 5.6 kg/Hp, 179.9 Hp/tonne |
| Weight-to-torque ratio | 2.8 kg/Nm, 362.1 Nm/tonne |
| Power | 313 Hp @ 4400 rpm |
| Power per litre | 104.6 Hp/l |
| 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 | 1740 kg (3836.04 lbs.) |
| Max. weight | 2255 kg (4971.42 lbs.) |
| Max load | 515 kg (1135.38 lbs.) |
| Trunk (boot) space – minimum | 460 l (16.24 cu. ft.) |
| Fuel tank capacity | 70 l (18.49 US gal | 15.4 UK gal) |
| Max. roof load | 75 kg (165.35 lbs.) |
| Length | 4894 mm (192.68 in.) |
| Width | 1894 mm (74.57 in.) |
| Height | 1369 mm (53.9 in.) |
| Wheelbase | 2855 mm (112.4 in.) |
| Front track | 1600 mm (62.99 in.) |
| Rear track | 1665 mm (65.55 in.) |
| Ride height (ground clearance) | 124 mm (4.88 in.) |
| Drag coefficient (Cd) | 0.28 |
| Minimum turning circle | 11.7 m (38.39 ft.) |
| Drivetrain Architecture | Rear wheel drive |
| Number of gears | 8 |
| Gearbox type | Automatic transmission Steptronic |
| Front suspension | Double wishbone |
| Rear suspension | Independent multi-link suspension |
| Front brakes | Disc |
| Rear brakes | Disc |
INTRODUCTION
The F13 LCI 640d, launched in 2015, built upon the foundation of the original F13 6 Series Coupe, introducing subtle yet significant styling revisions, updated technology, and refined engine options. Positioned as a luxurious and capable grand tourer, the 640d aimed to deliver a balance of performance, efficiency, and comfort. It slotted into the 6 Series range above the 630d and below the more performance-focused 650i, catering to drivers who prioritized a refined driving experience with strong diesel torque. The LCI (Life Cycle Impulse) facelift brought revised headlights with BMW’s then-new laserlight technology, a redesigned front bumper, and updated interior trim options.
Powertrain & Engine Architecture
At the heart of the 640d lies BMW’s N57D30B inline-six diesel engine. This 3.0-liter engine, a mainstay in BMW’s diesel lineup, is renowned for its robust construction and impressive torque output. The N57D30B utilizes a sophisticated common-rail direct injection system, delivering fuel at extremely high pressures for optimized combustion. A twin-turbocharger setup – one low-inertia turbo for immediate response and a larger turbo for peak power – contributes to the engine’s broad torque curve. The engine also features variable valve timing (VANOS) and variable turbine geometry (VTG) on the turbochargers to further enhance efficiency and performance. Paired with the engine is BMW’s 8-speed Steptronic automatic transmission. This transmission offers smooth and quick shifts, and features adaptive learning algorithms to optimize shift points based on driving style. The transmission also includes paddle shifters for manual control.
Driving Characteristics
The 640d Steptronic delivers a distinctly different driving experience compared to its gasoline-powered siblings or even manual diesel variants. The abundant 630 Nm (464.66 lb-ft) of torque available from just 1500 rpm provides effortless acceleration in virtually any gear. While not as overtly sporty as the 650i, the 640d offers a strong and confident surge of power, making it ideal for long-distance cruising and overtaking. The 8-speed automatic transmission contributes to a relaxed driving experience, seamlessly shifting through the gears. The gear ratios are tuned for both fuel efficiency and responsive acceleration. Compared to a manual transmission, the automatic prioritizes smoothness and ease of use, but may feel slightly less engaging for drivers seeking a more direct connection to the drivetrain.
Equipment & Trim Levels
The 640d typically came well-equipped as standard, reflecting its positioning as a luxury coupe. Standard features included leather upholstery, power-adjustable seats with memory function, a premium sound system, automatic climate control, and BMW’s iDrive infotainment system with a high-resolution display. The LCI facelift brought updated iDrive software and connectivity options. Optional extras were plentiful, including adaptive cruise control, a head-up display, a panoramic sunroof, upgraded leather trim, and various driver assistance systems. Interior trim options ranged from elegant wood veneers to sporty aluminum accents. Exterior customization options included a variety of wheel designs and paint colors.
Chassis & Braking
The 6 Series Coupe featured a sophisticated chassis designed to balance comfort and handling. The front suspension utilized a double-wishbone setup, while the rear employed an independent multi-link suspension. This configuration provided a comfortable ride while maintaining precise control and minimizing body roll. The 640d was equipped with disc brakes on all four wheels, providing ample stopping power. Anti-lock braking system (ABS), electronic stability control (ESC), and traction control were standard safety features. Adaptive suspension options were available, allowing drivers to adjust the damping characteristics to suit their preferences.
Market Reception & Comparison
The 640d was generally well-received by automotive critics, who praised its refined driving experience, powerful engine, and luxurious interior. It was often lauded as a compelling alternative to gasoline-powered coupes, offering comparable performance with significantly improved fuel economy. Compared to the 630d, the 640d offered a substantial power increase, resulting in noticeably quicker acceleration. However, the 640d was more expensive than the 630d. Against the 650i, the 640d offered a more economical option, albeit with slightly less outright performance. Fuel economy was a key strength of the 640d, consistently achieving impressive figures in real-world testing.
Legacy
The N57D30B engine, found in the 640d, has proven to be remarkably reliable, with many examples exceeding high mileage with proper maintenance. The 8-speed Steptronic transmission is also known for its durability. On the used car market, the F13 640d represents a good value proposition, offering a luxurious and capable grand tourer at a more accessible price point than when new. However, potential buyers should be mindful of regular maintenance requirements, including diesel particulate filter (DPF) servicing and injector health. The F13 6 Series, and the 640d in particular, remains a desirable choice for those seeking a sophisticated and rewarding driving experience.
