The BMW 6 Series Coupe (F13) 640d xDrive Steptronic, produced from 2012 to 2015, represents a compelling blend of performance, luxury, and efficiency within the F13 6 Series generation. Positioned as a mid-to-high range offering, it catered to buyers seeking a grand touring coupe with strong diesel power and all-wheel drive capability. This variant distinguished itself from the gasoline-powered 640i and the higher-performance 650i models, as well as the more economy-focused 630d, offering a unique balance of power and fuel economy. The F13 generation itself was a successor to the E63, aiming to recapture the classic coupe proportions and driving experience that had defined earlier 6 Series models.
Technical Specifications
| Brand | BMW |
| Model | 6 Series |
| Generation | 6 Series Coupe (F13) |
| Type (Engine) | 640d (313 Hp) xDrive Steptronic |
| Start of production | 2012 |
| End of production | 2015 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Coupe |
| Seats | 4 |
| Doors | 2 |
| Fuel consumption (urban) | 6.9-7.1 l/100 km (34.1 – 33.1 US mpg, 40.9 – 39.8 UK mpg, 14.5 – 14.1 km/l) |
| Fuel consumption (extra urban) | 5.0-5.1 l/100 km (47 – 46.1 US mpg, 56.5 – 55.4 UK mpg, 20 – 19.6 km/l) |
| Fuel consumption (combined) | 5.7-5.8 l/100 km (41.3 – 40.6 US mpg, 49.6 – 48.7 UK mpg, 17.5 – 17.2 km/l) |
| CO2 emissions | 149-153 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 | 5.7 kg/Hp, 174.4 Hp/tonne |
| Weight-to-torque ratio | 2.8 kg/Nm, 351 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 | 1795 kg (3957.3 lbs.) |
| Max. weight | 2310 kg (5092.68 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 (Back) track | 1665 mm (65.55 in.) |
| Ride height (ground clearance) | 124 mm (4.88 in.) |
| Drag coefficient (Cd) | 0.30 |
| Minimum turning circle (turning diameter) | 11.7 m (38.39 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 | 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; 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 |
Powertrain & Engine Architecture
The heart of the 640d xDrive Steptronic is BMW’s N57D30B inline-six diesel engine. This engine, a member of the N57 family, is renowned for its robust construction and sophisticated technology. It features a common-rail direct injection system operating at extremely high pressures (typically around 2,000 bar) for optimized fuel atomization and combustion efficiency. The N57D30B utilizes a variable geometry turbocharger (VGT) and an intercooler to deliver a broad torque curve and impressive power output. The twin-power turbo setup further enhances responsiveness and minimizes turbo lag. The engine’s aluminum alloy cylinder head incorporates four valves per cylinder, contributing to efficient gas exchange. Paired with the engine is BMW’s 8-speed Steptronic automatic transmission. This transmission is known for its smooth shifts, quick response, and ability to adapt to driving conditions. It offers both fully automatic operation and manual shift control via steering wheel-mounted paddles or the gear selector.
Driving Characteristics
The 640d xDrive Steptronic delivers a refined and effortless driving experience. The substantial 630 Nm (464 lb-ft) of torque, available from a low 1500 rpm, provides strong acceleration in virtually any gear. While not as overtly sporty as the 640i or 650i, the 640d offers ample power for confident overtaking and highway cruising. The xDrive all-wheel drive system provides excellent traction and stability, particularly in adverse weather conditions. The 8-speed automatic transmission is well-matched to the engine’s characteristics, providing smooth and timely gear changes. The gear ratios are tuned for a balance of performance and fuel economy. Compared to the manual transmission options available in other 6 Series models, the automatic prioritizes comfort and ease of use, making it ideal for long-distance journeys.
Equipment & Trim Levels
The 640d xDrive Steptronic typically came well-equipped as standard. Features included leather upholstery, power-adjustable front seats with memory function, a premium sound system, dual-zone automatic climate control, and BMW’s iDrive infotainment system with a central display screen. Optional extras were plentiful, allowing buyers to personalize their vehicles. These included features like adaptive cruise control, a head-up display, a panoramic sunroof, upgraded leather trim, and various driver assistance systems. Interior trim options ranged from wood veneers to aluminum accents, allowing for a customized aesthetic.
Chassis & Braking
The F13 6 Series Coupe features a sophisticated chassis designed to deliver a balance of comfort and handling. The front suspension utilizes a double wishbone setup, while the rear employs an independent multi-link suspension. This configuration provides excellent wheel control and minimizes body roll. The 640d xDrive Steptronic is equipped with ventilated 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 control. The xDrive all-wheel drive system distributes power between the front and rear axles as needed, optimizing traction and stability.
Market Reception & Comparison
The 640d xDrive Steptronic was generally well-received by automotive critics. It was praised for its refined driving experience, strong fuel economy, and luxurious interior. Compared to the 640i, the 640d offered superior fuel efficiency and a broader torque curve, making it a more practical choice for long-distance driving. However, the 640i provided a more engaging and sporty driving experience. The 650i, with its larger engine, offered even greater performance but at the expense of fuel economy. The 630d, while more affordable, lacked the outright power and refinement of the 640d.
Legacy
The N57 engine family, including the N57D30B found in the 640d, has proven to be remarkably reliable. With proper maintenance, these engines can accumulate high mileage without major issues. The 8-speed Steptronic transmission is also known for its durability. In the used car market, the F13 640d xDrive Steptronic represents a compelling value proposition, offering a blend of luxury, performance, and efficiency at a relatively affordable price point. 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 reliability of this powertrain.
