The BMW 6 Series Coupe (F13) 640i xDrive Steptronic, produced from 2013 to 2015, represents a compelling blend of performance and luxury within the F13 6 Series generation. Positioned as a mid-range offering in the coupe lineup, it slotted between the 630i and the higher-performance 650i models. This variant aimed to deliver a refined grand touring experience with the added security of BMW’s xDrive all-wheel-drive system and the convenience of an eight-speed Steptronic automatic transmission. The F13 generation itself was a successor to the E63, aiming for a more sophisticated and driver-focused experience.
Technical Specifications
| Brand | BMW |
| Model | 6 Series |
| Generation | 6 Series Coupe (F13) |
| Type | 640i (320 Hp) xDrive Steptronic |
| Start of production | 2013 |
| End of production | 2015 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Coupe |
| Seats | 4 |
| Doors | 2 |
| Fuel consumption (urban) | 11.0-11.2 l/100 km (21.4 – 21 US mpg, 25.7 – 25.2 UK mpg, 9.1 – 8.9 km/l) |
| Fuel consumption (extra urban) | 6.4-6.5 l/100 km (36.8 – 36.2 US mpg, 44.1 – 43.5 UK mpg, 15.6 – 15.4 km/l) |
| Fuel consumption (combined) | 8.1-8.2 l/100 km (29 – 28.7 US mpg, 34.9 – 34.4 UK mpg, 12.3 – 12.2 km/l) |
| CO2 emissions | 188-191 g/km |
| Fuel Type | Petrol (Gasoline) |
| 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 | 5.5 kg/Hp, 181.3 Hp/tonne |
| Weight-to-torque ratio | 3.9 kg/Nm, 255 Nm/tonne |
| Power | 320 Hp @ 5800-6000 rpm |
| Power per litre | 107.4 Hp/l |
| Torque | 450 Nm @ 1300-4500 rpm (331.9 lb.-ft. @ 1300-4500 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | N55B30A |
| Engine displacement | 2979 cm3 (181.79 cu. in.) |
| Number of cylinders | 6 |
| Engine configuration | Inline |
| Cylinder Bore | 84 mm (3.31 in.) |
| Piston Stroke | 89.6 mm (3.53 in.) |
| Compression ratio | 10.2:1 |
| Number of valves per cylinder | 4 |
| Fuel injection system | Direct injection |
| Engine aspiration | Twin-power turbo, Intercooler |
| Engine oil capacity | 6.5 l (6.87 US qt | 5.72 UK qt) |
| Coolant | 9.3 l (9.83 US qt | 8.18 UK qt) |
| Kerb Weight | 1765 kg (3891.16 lbs.) |
| Max. weight | 2255 kg (4971.42 lbs.) |
| Max load | 490 kg (1080.27 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 640i xDrive is BMW’s N55B30A 3.0-liter inline-six engine. This engine is a direct-injection, twin-turbocharged powerplant known for its smooth power delivery and responsiveness. The N55 utilizes Valvetronic technology, which allows for precise control of valve lift and timing, optimizing both power and efficiency. The twin-turbo setup employs a single twin-scroll turbocharger, enhancing low-end torque and minimizing turbo lag. The engine produces 320 horsepower at 5800-6000 rpm and 450 Nm (331.9 lb-ft) of torque between 1300 and 4500 rpm. This power is then channeled through BMW’s eight-speed Steptronic automatic transmission, which offers both fully automatic operation and manual gear selection via steering wheel-mounted paddles. The xDrive all-wheel-drive system distributes power between the front and rear axles as needed, providing enhanced traction and stability, particularly in adverse weather conditions.
Driving Characteristics
The 640i xDrive Steptronic delivers a refined and capable driving experience. While not as overtly sporty as the 650i, the 320 hp engine provides ample power for confident overtaking and cruising. The eight-speed automatic transmission is well-tuned, offering smooth and quick shifts. The xDrive system contributes to excellent grip and stability, inspiring confidence in various driving conditions. Compared to the 630i, the 640i offers a noticeable performance upgrade, while the automatic transmission, though convenient, doesn’t quite match the engagement of the available six-speed manual. The gear ratios are optimized for both fuel efficiency and responsive acceleration, with a focus on providing strong mid-range torque.
Equipment & Trim Levels
The 640i xDrive typically came well-equipped as standard. Common features included leather upholstery, power-adjustable 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, including features like a head-up display, active steering, adaptive cruise control, and various interior trim options. The interior design emphasized luxury and comfort, with high-quality materials and a driver-focused layout. Exterior options included a variety of wheel designs and paint colors.
Chassis & Braking
The F13 6 Series Coupe features a sophisticated chassis design. The front suspension utilizes a double wishbone setup, while the rear employs an independent multi-link suspension. This configuration provides a good balance between ride comfort and handling precision. The 640i xDrive is equipped with ventilated disc brakes on all four wheels, providing ample stopping power. ABS (Anti-lock Braking System) is standard, along with electronic stability control and traction control systems. The steering is a rack-and-pinion system with electric power assistance, offering precise and responsive steering feel.
Market Reception & Comparison
The 640i xDrive was generally well-received by automotive critics. It was praised for its refined driving experience, powerful engine, and luxurious interior. However, some reviewers noted that the automatic transmission, while smooth, lacked the engagement of a manual gearbox. Compared to the 650i, the 640i offered a more accessible price point while still delivering a high level of performance and luxury. Fuel economy was considered respectable for a vehicle in this class, with combined figures ranging from 8.1 to 8.2 l/100 km. Reliability reports suggest that the N55 engine is generally robust, although preventative maintenance is crucial.
Legacy
The BMW 6 Series Coupe (F13) 640i xDrive Steptronic has established itself as a desirable used grand tourer. The N55 engine has proven to be relatively reliable, although regular oil changes and maintenance are essential. The xDrive all-wheel-drive system remains a valuable asset in regions with inclement weather. Today, these vehicles can be found in good condition, offering a blend of performance, luxury, and practicality at a more affordable price point than when new. The F13 6 Series, and the 640i variant specifically, represents a high point in BMW’s coupe design and engineering.
