The BMW 5 Series Touring (G31) M550d xDrive Steptronic, produced from 2017 to 2020, represents a high-performance iteration of BMW’s popular executive wagon. Positioned as a premium offering within the G31 5 Series Touring range, the M550d combined potent diesel power with the practicality of a station wagon (estate) body style. It served as a flagship model, bridging the gap between the more mainstream 5 Series variants and the full-fledged M5 performance sedan. This model was primarily aimed at European markets where the demand for high-performance diesels and practical wagons remained strong, though limited examples were available in other regions.
Technical Specifications
| Brand | BMW |
| Model | 5 Series |
| Generation | 5 Series Touring (G31) |
| Type | M550d (400 Hp) xDrive Steptronic |
| Start of production | 2017 |
| End of production | 2020 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Station wagon (estate) |
| Seats | 5 |
| Doors | 5 |
| Fuel consumption (urban) | 7.4-7.8 l/100 km (31.8 – 30.2 US mpg, 38.2 – 36.2 UK mpg, 13.5 – 12.8 km/l) |
| Fuel consumption (extra urban) | 5.9-6.1 l/100 km (39.9 – 38.6 US mpg, 47.9 – 46.3 UK mpg, 16.9 – 16.4 km/l) |
| Fuel consumption (combined) | 6.4-6.7 l/100 km (36.8 – 35.1 US mpg, 44.1 – 42.2 UK mpg, 15.6 – 14.9 km/l) |
| CO2 emissions | 168-176 g/km |
| Fuel Type | Diesel |
| Acceleration 0 – 100 km/h | 4.6 sec |
| Acceleration 0 – 62 mph | 4.6 sec |
| Acceleration 0 – 60 mph | 4.4 sec |
| Maximum speed | 250 km/h (155.34 mph) |
| Emission standard | Euro 6 |
| Weight-to-power ratio | 4.9 kg/Hp, 204.6 Hp/tonne |
| Weight-to-torque ratio | 2.6 kg/Nm, 388.7 Nm/tonne |
| Power | 400 Hp @ 4400 rpm |
| Power per litre | 133.6 Hp/l |
| Torque | 760 Nm @ 2000-3000 rpm (560.55 lb.-ft. @ 2000-3000 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | B57D30C |
| 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 | 11.9 l (12.57 US qt | 10.47 UK qt) |
| Kerb Weight | 1955 kg (4310.04 lbs.) |
| Max. weight | 2620 kg (5776.11 lbs.) |
| Max load | 665 kg (1466.07 lbs.) |
| Trunk (boot) space – minimum | 570 l (20.13 cu. ft.) |
| Trunk (boot) space – maximum | 1700 l (60.03 cu. ft.) |
| Fuel tank capacity | 66 l (17.44 US gal | 14.52 UK gal) |
| Permitted trailer load with brakes (8%) | 2000 kg (4409.25 lbs.) |
| Permitted trailer load with brakes (12%) | 2000 kg (4409.25 lbs.) |
| Permitted trailer load without brakes | 750 kg (1653.47 lbs.) |
| Permitted towbar download | 90 kg (198.42 lbs.) |
| Length | 4962 mm (195.35 in.) |
| Width | 1868 mm (73.54 in.) |
| Width including mirrors | 2126 mm (83.7 in.) |
| Height | 1488 mm (58.58 in.) |
| Wheelbase | 2975 mm (117.13 in.) |
| Drag coefficient (Cd) | 0.31 |
| Drive wheel | All wheel drive (4×4) |
| Number of gears and type of gearbox | 8 gears, automatic transmission Steptronic |
| Front brakes | Ventilated discs |
| Rear brakes | Disc |
INTRODUCTION
The G31 M550d xDrive Steptronic, launched in 2017, was a key component of BMW’s 5 Series Touring lineup. Built on the 1HX0/A3 platform, it offered a compelling blend of performance, luxury, and practicality. It distinguished itself from the standard 5 Series Touring models through its significantly more powerful engine, upgraded suspension components, and subtle but purposeful styling cues. The M550d aimed to appeal to buyers who desired the driving experience of a performance car without sacrificing the versatility of a wagon. Production concluded in 2020, coinciding with BMW’s broader shift towards electrified performance models.
Powertrain & Engine Architecture
At the heart of the M550d lies the B57D30C, a 3.0-liter inline-six diesel engine. This engine is a marvel of modern diesel technology, featuring a sophisticated common-rail direct injection system and a twin-turbocharger setup. The twin-turbo configuration utilizes a low-pressure turbocharger for enhanced responsiveness and a high-pressure turbocharger to deliver substantial peak power. The engine boasts a high compression ratio of 16:1, contributing to its efficiency and power output. Paired with the engine is BMW’s 8-speed Steptronic automatic transmission, known for its smooth and quick shifts. This transmission is specifically tuned to handle the high torque output of the diesel engine and features steering wheel-mounted paddle shifters for manual control. The xDrive all-wheel-drive system intelligently distributes power between the front and rear axles, optimizing traction and stability in various driving conditions.
Driving Characteristics
The M550d delivers a remarkably refined yet potent driving experience. The 760 Nm (560.55 lb.-ft.) of torque, available from just 2000 rpm, provides effortless acceleration in virtually any gear. The 0-60 mph sprint takes approximately 4.4 seconds, making it genuinely quick for a wagon. The Steptronic transmission contributes to this performance with its seamless gear changes. While not as overtly sporty as the M5, the M550d offers a confident and composed ride, thanks to its adaptive suspension and precise steering. The xDrive system provides excellent grip, particularly in inclement weather. Compared to the 520d or 530d variants, the M550d offers a significantly more powerful and responsive driving experience. It also feels more planted and stable at higher speeds. However, the higher-output gasoline engines, like those found in the 540i, provide a different character, with a higher revving nature and a more traditional sports car feel.
Equipment & Trim Levels
The M550d xDrive Steptronic came generously equipped as standard. Interior features typically included leather upholstery, power-adjustable front seats with memory function, a premium sound system, and a large infotainment screen with BMW’s iDrive system. Standard safety features included automatic emergency braking, lane departure warning, and adaptive cruise control. Optional extras included a head-up display, ventilated front seats, a panoramic sunroof, and various driver-assistance systems. The interior trim could be customized with different wood or aluminum accents. Exterior styling cues included M Sport aerodynamic enhancements, unique alloy wheel designs, and subtle M badging.
Chassis & Braking
The M550d featured a chassis tuned for both performance and comfort. The suspension system utilized adaptive dampers, allowing the driver to adjust the ride quality to suit their preferences. The front suspension employed a double-wishbone design, while the rear utilized a multi-link setup. Braking duties were handled by ventilated discs at all four corners, providing ample stopping power. The braking system was also equipped with ABS (Anti-lock braking system) and electronic brake-force distribution. Compared to lower-spec 5 Series Touring models, the M550d often featured thicker stabilizer bars and stiffer suspension components to reduce body roll and improve handling.
Market Reception & Comparison
The M550d xDrive Steptronic was generally well-received by automotive critics. It was praised for its powerful engine, refined ride, and practical wagon body style. However, some reviewers noted that the diesel engine, while potent, lacked the emotional appeal of a gasoline engine. Fuel economy was a strong point, with combined figures ranging from 6.4 to 6.7 l/100 km (36.8 – 35.1 US mpg). Compared to the 530d, the M550d offered significantly more performance but at a higher price point. Against the petrol-powered 540i, the M550d provided comparable acceleration but with superior fuel economy and a different driving character. Reliability was generally good, although the complex turbocharging system and common-rail injection system required careful maintenance.
Legacy
The BMW M550d xDrive Steptronic (G31) represents a high point in the development of high-performance diesel wagons. While BMW has shifted its focus towards electrified performance models, the M550d remains a desirable vehicle in the used car market. Its combination of power, practicality, and refinement continues to appeal to buyers seeking a unique and capable vehicle. The B57 engine, in particular, has proven to be robust and reliable when properly maintained. However, potential buyers should be aware of the higher maintenance costs associated with the complex diesel engine and turbocharging system. The G31 M550d stands as a testament to BMW’s engineering prowess and its commitment to offering a diverse range of vehicles to suit different tastes and needs.
