The BMW 5 Series M550i xDrive, produced from 2017 to 2018 as part of the G30 generation, represents a performance-oriented variant of the popular 5 Series sedan. Positioned between the standard 5 Series models and the full-fledged M5, the M550i aimed to deliver a significant boost in power and handling without the outright track-focused nature of the M5. It served as a compelling option for drivers seeking a luxurious yet exhilarating driving experience. This variant utilized BMW’s xDrive all-wheel-drive system and the Steptronic 8-speed automatic transmission, making it a technologically advanced offering in the executive sedan segment.
Technical Specifications
| Brand | BMW |
| Model | 5 Series |
| Generation | 5 Series Sedan (G30) |
| Type (Engine) | M550i (462 Hp) xDrive Steptronic |
| Start of production | 2017 |
| End of production | 2018 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Sedan |
| Seats | 5 |
| Doors | 4 |
| Fuel consumption (urban) | 12.7 l/100 km (18.5 US mpg, 22.2 UK mpg, 7.9 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) | 8.9 l/100 km (26.4 US mpg, 31.7 UK mpg, 11.2 km/l) |
| CO2 emissions | 204 g/km |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 100 km/h | 4 sec |
| Acceleration 0 – 62 mph | 4 sec |
| Acceleration 0 – 60 mph | 3.8 sec |
| Maximum speed | 250 km/h (155.34 mph) |
| Emission standard | Euro 6 |
| Weight-to-power ratio | 3.9 kg/Hp, 255.2 Hp/tonne |
| Weight-to-torque ratio | 2.8 kg/Nm, 359.1 Nm/tonne |
| Power | 462 Hp @ 5500-6000 rpm |
| Power per litre | 105.1 Hp/l |
| Torque | 650 Nm @ 1800-4750 rpm (479.42 lb.-ft. @ 1800-4750 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | N63B44C |
| Engine displacement | 4395 cm3 (268.2 cu. in.) |
| Number of cylinders | 8 |
| Engine configuration | V-engine |
| Cylinder Bore | 89 mm (3.5 in.) |
| Piston Stroke | 88.3 mm (3.48 in.) |
| Compression ratio | 10.5:1 |
| 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 | 11.9 l (12.57 US qt | 10.47 UK qt) |
| Kerb Weight | 1810 kg (3990.37 lbs.) |
| Max. weight | 2460 kg (5423.37 lbs.) |
| Max load | 650 kg (1433 lbs.) |
| Trunk (boot) space – minimum | 530 l (18.72 cu. ft.) |
| Fuel tank capacity | 68 l (17.96 US gal | 14.96 UK gal) |
| Max. roof load | 100 kg (220.46 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.) |
| Height | 1467 mm (57.76 in.) |
| Wheelbase | 2975 mm (117.13 in.) |
| Front track | 1600 mm (62.99 in.) |
| Rear (Back) track | 1597 mm (62.87 in.) |
| Ride height (ground clearance) | 131 mm (5.16 in.) |
| Drag coefficient (Cd) | 0.28 |
| Minimum turning circle (turning diameter) | 12.24 m (40.16 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 | 245/40 R19 98Y; 275/35 R19 100Y |
| Wheel rims size | 8.0J x 19; 9.0J x 19 |
Powertrain & Engine Architecture
The heart of the M550i is BMW’s N63B44C 4.4-liter twin-turbocharged V8 engine. This engine is a member of the N63 family, known for its robust construction and high output. The N63B44C features direct fuel injection, a sophisticated valvetrain with Double-VANOS (variable valve timing and lift), and two twin-scroll turbochargers. These turbochargers work in concert to minimize turbo lag and deliver a broad, flat torque curve. The engine produces 462 horsepower at 5,500-6,000 rpm and a substantial 650 Nm (479 lb-ft) of torque between 1,800 and 4,750 rpm. The engine is longitudinally mounted at the front of the vehicle. Paired with the engine is the ZF 8HP70 eight-speed automatic transmission, marketed by BMW as Steptronic. This transmission is renowned for its smooth and quick shifts, and its ability to adapt to driving conditions. The xDrive all-wheel-drive system intelligently distributes power between the front and rear axles, enhancing traction and stability, particularly in adverse weather conditions.
Driving Characteristics
The M550i delivers a compelling blend of performance and comfort. The abundant torque from the V8 engine provides effortless acceleration in everyday driving situations. The 0-60 mph sprint takes approximately 3.8 seconds, making it a genuinely quick car. The Steptronic transmission contributes to this performance with its rapid gear changes and intelligent shift programming. Compared to the standard 5 Series models with four-cylinder or six-cylinder engines, the M550i offers a significantly more powerful and engaging driving experience. While not as overtly sporty as the M5, the M550i provides a more than adequate level of performance for most drivers. The xDrive system ensures confident handling in all conditions, and the adaptive suspension (often equipped as standard or an option) allows drivers to tailor the ride quality to their preferences.
Equipment & Trim Levels
The M550i typically came well-equipped as standard. Common features included leather upholstery, power-adjustable front seats with memory function, a premium sound system, a large infotainment screen with iDrive controller, navigation, and a suite of driver-assistance systems such as lane departure warning, forward collision warning, and automatic emergency braking. Optional extras included features like massaging seats, a head-up display, a panoramic sunroof, and upgraded interior trim materials. The exterior styling was also subtly enhanced with unique M Sport aerodynamic elements, such as a more aggressive front bumper, side skirts, and a rear diffuser.
Chassis & Braking
The M550i utilizes a double-wishbone front suspension and an independent multi-link rear suspension, providing a comfortable yet controlled ride. The suspension geometry and damping rates were specifically tuned to complement the increased power output of the V8 engine. The braking system consists of ventilated discs on all four wheels, providing ample stopping power. Larger brake rotors and upgraded calipers were often included as part of the M Sport package. The steering is an electric power-assisted rack-and-pinion system, offering precise and responsive steering feel.
Market Reception & Comparison
The M550i was generally well-received by automotive critics. It was praised for its powerful engine, refined ride quality, and luxurious interior. Some reviewers noted that it didn’t quite offer the same level of driver engagement as the M5, but it provided a more practical and comfortable daily driving experience. Compared to other performance sedans in its class, such as the Mercedes-AMG E 53 and the Audi S6, the M550i offered a compelling combination of performance, luxury, and technology. Fuel economy was reasonable for a V8-powered sedan, averaging around 26.4 US mpg in combined driving.
Legacy
The N63B44C engine, while generally reliable, has been known to exhibit some issues related to the cooling system and turbochargers, particularly if maintenance is neglected. Regular oil changes and diligent attention to cooling system components are crucial for long-term reliability. The Steptronic 8-speed automatic transmission has proven to be exceptionally durable. On the used car market, the G30 M550i holds its value relatively well, due to its performance credentials and luxurious features. It remains a desirable option for buyers seeking a high-performance executive sedan that offers a blend of comfort, technology, and driving enjoyment.
