The BMW 6 Series Coupe (F13) 640d Steptronic, produced from 2011 to 2015, represented a compelling blend of performance, luxury, and efficiency within the 6 Series lineup. Positioned as a mid-range offering, it slotted between the entry-level 630d and the higher-performance 650i models. This variant aimed to deliver a refined grand touring experience with the added benefit of diesel economy, appealing to buyers prioritizing long-distance comfort and reduced running costs. The F13 generation, built on the BMW F06 platform, was the successor to the E63 and represented a significant step forward in terms of technology, styling, and driving dynamics.
Technical Specifications
| Brand | BMW |
| Model | 6 Series |
| Generation | 6 Series Coupe (F13) |
| Type (Engine) | 640d (313 Hp) Steptronic |
| Start of production | 2011 |
| End of production | 2015 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Coupe |
| Seats | 4 |
| Doors | 2 |
| Fuel consumption (urban) | 6.6-6.7 l/100 km (35.6 – 35.1 US mpg, 42.8 – 42.2 UK mpg, 15.2 – 14.9 km/l) |
| Fuel consumption (extra urban) | 4.8 l/100 km (49 US mpg, 58.9 UK mpg, 20.8 km/l) |
| Fuel consumption (combined) | 5.4-5.5 l/100 km (43.6 – 42.8 US mpg, 52.3 – 51.4 UK mpg, 18.5 – 18.2 km/l) |
| CO2 emissions | 143-145 g/km |
| Fuel Type | Diesel |
| 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 6 |
| Weight-to-power ratio | 5.5 kg/Hp, 182.5 Hp/tonne |
| Weight-to-torque ratio | 2.7 kg/Nm, 367.3 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 | 1715 kg (3780.93 lbs.) |
| Max. weight | 2220 kg (4894.26 lbs.) |
| Max load | 505 kg (1113.33 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 (Back) track | 1665 mm (65.55 in.) |
| Ride height (ground clearance) | 124 mm (4.88 in.) |
| Drag coefficient (Cd) | 0.29 |
| 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 | Double wishbone |
| Front brakes | Ventilated discs |
| Rear brakes | Ventilated discs |
| 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 |
| Wheel rims size | 8J x 17; 8J x 18; 9J x 18; 8.5J x 19; 9J x 19 |
Powertrain & Engine Architecture
The heart of the 640d Steptronic 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 pressures for optimized combustion. The N57 engine family is renowned for its efficiency and durability. The 640d specifically benefits from a twin-turbocharger setup – a smaller turbo for quick response at low engine speeds and a larger turbo for sustained power at higher RPMs. An intercooler further enhances performance by cooling the compressed intake air. The engine 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 diesel engines and contributes to the 640d’s effortless acceleration. The engine is paired with BMW’s 8-speed Steptronic automatic transmission, known for its smooth shifts and intelligent programming. This transmission allows for both fully automatic operation and manual gear selection via steering wheel-mounted paddles.
Driving Characteristics
The 640d Steptronic delivers a distinctly grand touring experience. The abundant low-end torque makes for relaxed cruising and effortless overtaking. While not as overtly sporty as the 650i, the 640d offers more than adequate performance, achieving 0-60 mph in around 5.2 seconds. The 8-speed automatic transmission is well-matched to the engine’s characteristics, providing seamless gear changes and contributing to fuel efficiency. Compared to the 630d, the 640d offers a noticeable performance upgrade, while remaining more economical than the 650i. The steering is precise and well-weighted, providing good feedback to the driver. The suspension, tuned for comfort, effectively absorbs road imperfections, resulting in a smooth and refined ride.
Equipment & Trim Levels
The 640d Steptronic came standard with a generous array of features, including leather upholstery, automatic climate control, a premium sound system, and BMW’s iDrive infotainment system. Optional extras were plentiful, allowing buyers to personalize their vehicles. Popular options included adaptive cruise control, a head-up display, upgraded leather trim, and a panoramic sunroof. Interior trim options ranged from elegant wood veneers to modern aluminum accents. The standard seats provided excellent support and comfort, with optional multi-contour seats offering enhanced adjustability and massage functions.
Chassis & Braking
The F13 6 Series Coupe features a double-wishbone suspension setup at both the front and rear, providing a good balance between comfort and handling. The 640d typically came equipped with ventilated disc brakes on all four wheels, offering strong stopping power. ABS (Anti-lock Braking System) and electronic stability control were standard safety features. The steering system utilizes electric power assistance, providing precise and responsive steering feel. The chassis is designed to be relatively lightweight, contributing to the car’s agility and handling characteristics.
Market Reception & Comparison
The 640d Steptronic was generally well-received by automotive critics. It was praised for its refined driving experience, strong performance, and impressive fuel economy. Compared to the 630d, the 640d offered a significant power boost without sacrificing fuel efficiency. Against the 650i, it provided a more economical alternative, albeit with slightly less outright performance. Some critics noted that the diesel engine’s character lacked the aural excitement of the 650i’s V8, but the 640d’s overall refinement and practicality were highly regarded.
Legacy
The N57 engine family, including the N57D30B found in the 640d, has proven to be remarkably reliable. With proper maintenance, these engines can easily exceed 200,000 miles. The 640d Steptronic remains a desirable used car, offering a compelling combination of luxury, performance, and efficiency. However, potential buyers should be aware of the potential for diesel particulate filter (DPF) issues, particularly on vehicles that have primarily been used for short trips. Regular servicing and the use of high-quality diesel fuel are essential for maintaining the long-term health of the engine and DPF system. Today, the F13 640d represents a well-engineered and capable grand tourer that continues to offer a rewarding driving experience.
