The BMW X6 (E71) 40d xDrive Steptronic, produced from 2010 to 2012, represents a significant offering within the first generation of BMW’s Sports Activity Coupe (SAC). This variant, powered by the N57D30 engine, occupied a middle ground in the X6 lineup, positioned between the entry-level xDrive30d and the higher-performance xDrive50i. It aimed to deliver a balance of performance, efficiency, and luxury, appealing to buyers seeking a versatile and capable SUV with a sporting character. The E71 X6, launched in 2008, was a controversial vehicle upon release, pioneering a new segment and challenging traditional SUV design conventions. The 40d model specifically targeted European and international markets where diesel engines were favored for their fuel economy and torque.
Technical Specifications
| Brand | BMW |
| Model | X6 |
| Generation | X6 (E71) |
| Type (Engine) | 40d (306 Hp) xDrive Steptronic |
| Start of production | 2010 |
| End of production | 2012 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | SUV |
| Seats | 4 |
| Doors | 5 |
| Fuel consumption (urban) | 8.8 l/100 km (26.7 US mpg, 32.1 UK mpg, 11.4 km/l) |
| Fuel consumption (extra urban) | 6.8 l/100 km (34.6 US mpg, 41.5 UK mpg, 14.7 km/l) |
| Fuel consumption (combined) | 7.5 l/100 km (31.4 US mpg, 37.7 UK mpg, 13.3 km/l) |
| CO2 emissions | 198 g/km |
| Fuel Type | Diesel |
| Acceleration 0 – 100 km/h | 6.5 sec |
| Acceleration 0 – 62 mph | 6.5 sec |
| Acceleration 0 – 60 mph | 6.2 sec |
| Maximum speed | 236 km/h (146.64 mph) |
| Emission standard | Euro 5 |
| Weight-to-power ratio | 6.9 kg/Hp, 145 Hp/tonne |
| Weight-to-torque ratio | 3.5 kg/Nm, 284.4 Nm/tonne |
| Power | 306 Hp @ 4400 rpm |
| Power per litre | 102.2 Hp/l |
| Torque | 600 Nm @ 1500-2500 rpm (442.54 lb.-ft. @ 1500-2500 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | N57D30 |
| 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 | 6.7 l (7.08 US qt | 5.9 UK qt) |
| Coolant | 10.4 l (10.99 US qt | 9.15 UK qt) |
| Kerb Weight | 2110 kg (4651.75 lbs.) |
| Max. weight | 2710 kg (5974.53 lbs.) |
| Max load | 600 kg (1322.77 lbs.) |
| Trunk (boot) space – minimum | 570 l (20.13 cu. ft.) |
| Trunk (boot) space – maximum | 1450 l (51.21 cu. ft.) |
| Fuel tank capacity | 85 l (22.45 US gal | 18.7 UK gal) |
| Max. roof load | 100 kg (220.46 lbs.) |
| Permitted trailer load with brakes (12%) | 2700 kg (5952.48 lbs.) |
| Permitted trailer load without brakes | 750 kg (1653.47 lbs.) |
| Permitted towbar download | 120 kg (264.55 lbs.) |
| Length | 4877 mm (192.01 in.) |
| Width | 1983 mm (78.07 in.) |
| Height | 1690 mm (66.54 in.) |
| Wheelbase | 2933 mm (115.47 in.) |
| Front track | 1644 mm (64.72 in.) |
| Rear (Back) track | 1706 mm (67.17 in.) |
| Ride height (ground clearance) | 212 mm (8.35 in.) |
| Drag coefficient (Cd) | 0.34 |
| Minimum turning circle (turning diameter) | 12.8 m (41.99 ft.) |
| Approach angle | 25.1° |
| Departure angle | 25.5° |
| Ramp-over (brakeover) angle | 19.1° |
| Drive wheel | All wheel drive (4×4) |
| Number of gears and type of gearbox | 8 gears, automatic transmission Steptronic |
| Front suspension | Independent multi-link suspension |
| 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 |
| Tires size | 255/50 R19 |
| Wheel rims size | 9J x 19 |
Powertrain & Engine Architecture
The heart of the X6 40d is the BMW N57D30, a 3.0-liter inline-six diesel engine. This engine is a member of the N57 family, known for its robust construction and advanced technology. The N57D30 utilizes a common rail direct injection system, delivering fuel at extremely high pressures for optimized combustion. It’s equipped with a variable geometry turbocharger (VGT) and an intercooler, enhancing both power and efficiency. The engine also features a sophisticated valvetrain with Double-VANOS (variable valve timing) for both intake and exhaust valves, further improving responsiveness and reducing emissions. Paired with the engine is the ZF 8HP80 eight-speed automatic transmission, marketed by BMW as “Steptronic.” This transmission is renowned for its smooth shifts, wide gear ratios, and efficiency. The 8HP80 allows the engine to operate within its optimal power band more frequently, contributing to both performance and fuel economy.
Driving Characteristics
The X6 40d xDrive Steptronic offers a compelling driving experience. The 600 Nm (442 lb-ft) of torque available from 1500-2500 rpm provides strong acceleration and effortless overtaking capability. While not as overtly sporty as the X6 xDrive50i, the 40d delivers a respectable 0-60 mph time of around 6.2 seconds. The eight-speed automatic transmission contributes to a smooth and refined driving experience, with well-spaced gear ratios. Compared to the manual transmission options available on other X6 models, the Steptronic offers greater convenience, particularly in urban driving. However, some enthusiasts might find the automatic slightly less engaging than a manual gearbox. The xDrive all-wheel-drive system provides excellent traction and stability in all weather conditions, enhancing confidence and control.
Equipment & Trim Levels
The X6 40d xDrive Steptronic typically came well-equipped as standard. Features included leather upholstery, automatic climate control, a premium sound system, and BMW’s iDrive infotainment system. Optional extras were plentiful, allowing buyers to personalize their vehicle. Popular options included a panoramic sunroof, adaptive headlights, active steering, and upgraded interior trim packages. The X6 also offered a range of driver assistance systems, such as adaptive cruise control, lane departure warning, and a head-up display. Interior color choices were varied, with options ranging from classic black to more contemporary shades of beige and gray.
Chassis & Braking
The X6 E71 features an independent multi-link suspension at both the front and rear axles, providing a comfortable ride and precise handling. The suspension geometry is tuned to balance ride comfort with sporty handling characteristics. The 40d model typically came equipped with ventilated disc brakes on all four wheels, providing ample stopping power. Anti-lock braking system (ABS) and dynamic stability control (DSC) were standard features, enhancing safety and control. The X6’s chassis is relatively heavy, which contributes to its stability but also impacts agility.
Market Reception & Comparison
The X6 40d xDrive Steptronic was generally well-received by automotive critics. It was praised for its powerful and efficient engine, comfortable ride, and luxurious interior. However, some critics noted the X6’s polarizing styling and relatively high price. Compared to the X6 xDrive30d, the 40d offered a significant performance upgrade, while remaining more fuel-efficient than the X6 xDrive50i. In terms of reliability, the N57 engine family is generally considered robust, but potential issues include turbocharger failure and injector problems.
Legacy
The BMW X6 E71 40d xDrive Steptronic remains a desirable vehicle in the used car market. Its combination of performance, luxury, and practicality continues to appeal to buyers. The N57D30 engine is known for its longevity and relatively low maintenance costs, provided it has been properly maintained. However, potential buyers should be aware of the potential for turbocharger and injector issues. The E71 X6 paved the way for the modern Sports Activity Coupe segment, and the 40d variant represents a well-rounded and capable offering within the first generation of this groundbreaking vehicle.
