The BMW X6 (E71 LCI) M50d, produced from 2012 to 2014, represented a significant offering in the burgeoning luxury crossover segment. As a facelift of the original E71 X6, the LCI (Life Cycle Impulse) brought updated styling, improved technology, and crucially, the introduction of BMW’s potent M50d powertrain. This variant occupied the top performance tier of the X6 lineup below the full-blown X6 M, offering a compelling blend of luxury, performance, and relatively improved fuel economy compared to its petrol-powered siblings. The M50d was primarily marketed towards European and international markets, with limited availability in the United States due to diesel emissions regulations.
Technical Specifications
| Brand | BMW |
| Model | X6 |
| Generation | X6 (E71 LCI, facelift 2012) |
| Type (Engine) | M50d (381 Hp) Steptronic |
| Start of production | 2012 |
| End of production | 2014 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | SUV |
| Seats | 4 |
| Doors | 5 |
| Fuel consumption (economy) – urban (NEDC) | 9 l/100 km (26.1 US mpg, 31.4 UK mpg, 11.1 km/l) |
| Fuel consumption (economy) – extra urban (NEDC) | 7 l/100 km (33.6 US mpg, 40.4 UK mpg, 14.3 km/l) |
| Fuel consumption (economy) – combined (NEDC) | 7.7 l/100 km (30.5 US mpg, 36.7 UK mpg, 13 km/l) |
| CO2 emissions (NEDC) | 204 g/km |
| Fuel Type | Diesel |
| 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), Electronically limited |
| Emission standard | Euro 5 |
| Weight-to-power ratio | 5.6 kg/Hp, 177.2 Hp/tonne |
| Weight-to-torque ratio | 2.9 kg/Nm, 344.2 Nm/tonne |
| Power | 381 Hp @ 4000-4400 rpm |
| Power per litre | 127.3 Hp/l |
| Torque | 740 Nm @ 2000-3000 rpm (545.8 lb.-ft. @ 2000-3000 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | N57XD30 |
| 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 | 16:1 |
| Number of valves per cylinder | 4 |
| Fuel injection system | Diesel Commonrail |
| Engine aspiration | Twin-power turbo, Intercooler |
| Valvetrain | DOHC |
| Engine oil capacity | 6.5 l (6.87 US qt | 5.72 UK qt) |
| Coolant | 13 l (13.74 US qt | 11.44 UK qt) |
| Kerb Weight | 2150 kg (4739.94 lbs.) |
| Max. weight | 2750 kg (6062.71 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) |
| Permitted trailer load with brakes (12%) | 2700 kg (5952.48 lbs.) |
| Permitted trailer load without brakes | 750 kg (1653.47 lbs.) |
| Length | 4877 mm (192.01 in.) |
| Width | 1983 mm (78.07 in.) |
| Width including mirrors | 2195 mm (86.42 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.) |
| Minimum turning circle (turning diameter) | 12.8 m (41.99 ft.) |
| Front brakes | Ventilated discs, 385 mm |
| Rear brakes | Ventilated discs, 345 mm |
| Number of gears and type of gearbox | 8 gears, automatic transmission |
Powertrain & Engine Architecture
The heart of the X6 M50d is BMW’s N57XD30 engine, a 3.0-liter inline-six diesel engine. This engine is a masterpiece of engineering, employing a sophisticated common-rail direct injection system and a twin-turbocharger setup. The two turbochargers are sequentially staged; a smaller turbocharger provides quick response at low engine speeds, while a larger turbocharger takes over at higher speeds to deliver substantial power. The engine also features variable geometry turbocharging (VGT) for optimized performance across the rev range. The N57XD30 boasts a high compression ratio of 16:1, contributing to its efficiency and power output. The “XD” designation indicates a diesel engine with exhaust gas recirculation (EGR) and a diesel particulate filter (DPF) to meet stringent emissions standards. The Steptronic transmission is an 8-speed automatic, known for its smooth shifts and responsiveness. It’s programmed to prioritize fuel efficiency while still providing quick downshifts when needed.
Driving Characteristics
The X6 M50d delivers a remarkably refined driving experience. The 740 Nm (545.8 lb-ft) of torque available from just 2000 rpm provides effortless acceleration in virtually any situation. The 0-60 mph sprint takes around 5 seconds, making it genuinely quick for a large SUV. The 8-speed automatic transmission is well-matched to the engine, providing smooth and timely gear changes. Compared to the X6 xDrive35i (with its inline-six petrol engine), the M50d offers significantly more torque and a broader powerband, resulting in more relaxed cruising and stronger overtaking performance. While the petrol version might feel slightly more eager to rev, the M50d’s sheer pulling power is more impressive. The all-wheel-drive system provides excellent traction and stability, even in adverse weather conditions.
Equipment & Trim Levels
The M50d trim level was generously equipped as standard. Key features included leather upholstery, power-adjustable front seats with memory function, a premium sound system, navigation, and a panoramic sunroof. Optional extras included adaptive suspension, active steering, and various interior trim options. The interior design was typical BMW, with a driver-focused layout and high-quality materials. The LCI facelift brought subtle updates to the interior, including revised switchgear and improved infotainment system graphics.
Chassis & Braking
The X6 M50d featured a double-wishbone front suspension and an independent multi-link rear suspension. Many examples were equipped with optional air suspension, which provided a comfortable ride and allowed the ride height to be adjusted. The braking system consisted of ventilated discs all around, with larger discs at the front to handle the increased weight and performance. ABS, dynamic stability control (DSC), and traction control were standard safety features.
Market Reception & Comparison
The X6 M50d was generally well-received by automotive critics. It was praised for its powerful engine, refined ride, and luxurious interior. However, some critics noted that the X6’s styling remained polarizing. Compared to other X6 variants, the M50d offered the best balance of performance and fuel economy. While the X6 xDrive50i (with its V8 petrol engine) offered more outright power, it was significantly less fuel-efficient. The M50d also provided a more compelling alternative to competitors like the Porsche Cayenne Diesel and the Audi Q7 TDI.
Legacy
The N57XD30 engine has proven to be remarkably durable and reliable, provided it has been properly maintained. Regular servicing, including timely DPF regeneration and oil changes, is crucial. The X6 M50d remains a desirable used car, offering a unique combination of performance, luxury, and practicality. While diesel emissions regulations have impacted the value of diesel vehicles in some markets, the M50d continues to hold its own as a capable and refined luxury crossover. Its robust powertrain and well-engineered chassis ensure that it remains a competitive option for buyers seeking a high-performance SUV.
