The BMW 6 Series Gran Coupe (F06) 640i xDrive Steptronic was a performance-oriented variant of the F06 Gran Coupe model, produced from 2013 to 2015. Positioned as a mid-to-high range offering within the 6 Series lineup, it combined a potent inline-six engine with BMW’s xDrive all-wheel-drive system and the Steptronic eight-speed automatic transmission. This configuration aimed to deliver a blend of luxury, performance, and all-weather capability, appealing to buyers seeking a sophisticated grand tourer. The F06 Gran Coupe itself represented BMW’s entry into the four-door coupe market, offering a more stylish alternative to the traditional 5 Series sedan.
Technical Specifications
| Brand | BMW |
| Model | 6 Series |
| Generation | 6 Series Gran Coupe (F06) |
| Type (Engine) | 640i (320 Hp) xDrive Steptronic |
| Start of production | 2013 |
| End of production | 2015 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Coupe |
| Seats | 4 |
| Doors | 4 |
| Fuel consumption (economy) – urban | 11.1-11.3 l/100 km (21.2 – 20.8 US mpg) |
| Fuel consumption (economy) – extra urban | 6.4-6.6 l/100 km (36.8 – 35.6 US mpg) |
| Fuel consumption (economy) – combined | 8.1-8.3 l/100 km (29 – 28.3 US mpg) |
| CO2 emissions | 189-193 g/km |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 100 km/h | 5.3 sec |
| Acceleration 0 – 62 mph | 5.3 sec |
| Acceleration 0 – 60 mph | 5 sec |
| Maximum speed | 250 km/h (155.34 mph) |
| Emission standard | Euro 5 |
| Weight-to-power ratio | 5.7 kg/Hp, 175.3 Hp/tonne |
| Weight-to-torque ratio | 4.1 kg/Nm, 246.6 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 | 1825 kg (4023.44 lbs.) |
| Max. weight | 2430 kg (5357.23 lbs.) |
| Max load | 605 kg (1333.8 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) | 0.32 |
| 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 | 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; 245/40 R19; 275/35 R19; 245/35 R20; 275/30 R20 |
| Wheel rims size | 8J x 17; 8J 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 was the N55B30A, a 3.0-liter inline-six cylinder engine. This engine was a cornerstone of BMW’s mid-range performance offerings for several years. It featured direct fuel injection, a twin-scroll turbocharger, and Double-VANOS variable valve timing for both intake and exhaust camshafts. These technologies contributed to a broad torque curve and responsive power delivery. The N55 engine was known for its relatively high output for its displacement, achieving 320 horsepower and 450 Nm (331.9 lb-ft) of torque. The Steptronic eight-speed automatic transmission was paired with the engine, offering smooth and quick shifts. This transmission allowed for both fully automatic operation and manual gear selection via steering wheel-mounted paddles. The xDrive all-wheel-drive system distributed power between the front and rear axles, enhancing traction and stability, particularly in adverse weather conditions.
Driving Characteristics
The 640i xDrive Steptronic offered a refined and capable driving experience. The combination of the turbocharged inline-six and the eight-speed automatic resulted in brisk acceleration – 0 to 60 mph in around 5 seconds. While not as overtly sporty as the 650i models with their V8 engines, the 640i provided ample power for everyday driving and confident highway passing. The xDrive system minimized understeer and provided a secure feel, especially on slippery surfaces. The automatic transmission’s gear ratios were well-chosen, providing strong acceleration in lower gears and relaxed cruising at highway speeds. Compared to the manual transmission versions, the Steptronic offered greater convenience and ease of use, although some enthusiasts might have preferred the more engaging feel of a manual gearbox.
Equipment & Trim Levels
The 640i xDrive typically came well-equipped with standard features such as leather upholstery, power-adjustable front seats with memory function, a premium sound system, and a navigation system. Optional extras included features like active steering, adaptive suspension, a head-up display, and various interior trim options. The Gran Coupe’s interior was designed with a focus on luxury and comfort, offering a spacious cabin for four passengers. The rear seats, while not as spacious as those in a traditional sedan, provided adequate legroom for adults on shorter journeys. The trunk offered a generous 460 liters (16.24 cu. ft.) of cargo space, expanding to 1265 liters (44.67 cu. ft.) with the rear seats folded down.
Chassis & Braking
The F06 Gran Coupe featured a sophisticated chassis design with a double-wishbone front suspension and an independent multi-link rear suspension. This setup provided a comfortable ride while maintaining good handling characteristics. The 640i xDrive was equipped with ventilated disc brakes on all four wheels, providing ample stopping power. The ABS (Anti-lock Braking System) and stability control systems further enhanced safety. The steering was electrically assisted, offering precise and responsive control.
Market Reception & Comparison
The 640i xDrive was generally well-received by automotive critics. It was praised for its refined engine, comfortable ride, and luxurious interior. However, some reviewers noted that it lacked the outright performance of the 650i models. Compared to the 640i’s siblings, the 650i offered significantly more power and a more aggressive driving experience, but at a higher price point. The 640d, a diesel-powered variant, provided excellent fuel economy but lacked the responsiveness of the gasoline engine. The 640i xDrive struck a balance between performance, luxury, and efficiency, appealing to buyers who prioritized a well-rounded grand touring experience.
Legacy
The N55 engine, found in the 640i xDrive, has proven to be a relatively reliable powerplant, although it is not without its potential issues. Common concerns include oil leaks, fuel injector failures, and occasional cooling system problems. The Steptronic eight-speed automatic transmission is also generally reliable, but regular maintenance is crucial to ensure smooth operation. Today, the F06 640i xDrive represents a compelling value on the used car market, offering a luxurious and capable grand tourer at a more affordable price point than when new. Its combination of performance, comfort, and all-weather capability continues to appeal to buyers seeking a sophisticated and enjoyable driving experience.
