The BMW 4 Series Coupe (G22) M440d xDrive Steptronic, produced from 2021 to January 2024, represents a compelling blend of performance and efficiency within the broader 4 Series lineup. Positioned as a mid-to-high range offering, it caters to drivers seeking a refined grand touring experience with strong diesel power and all-wheel drive capability. This variant utilizes a mild hybrid system to enhance fuel economy and responsiveness. It is built on the G22 platform, sharing its underpinnings with the 3 Series (G20) sedan and other BMW models.
Technical Specifications
| Brand | BMW |
| Model | 4 Series |
| Generation | 4 Series Coupe (G22) |
| Type (Engine) | M440d (340 Hp) Mild Hybrid xDrive Steptronic |
| Start of production | 2021 |
| End of production | January, 2024 |
| Powertrain Architecture | MHEV (Mild Hybrid Electric Vehicle) |
| Body type | Coupe |
| Seats | 4 |
| Doors | 2 |
| Combined fuel consumption (WLTP) | 5.7-6.3 l/100 km (41.3 – 37.3 US mpg, 49.6 – 44.8 UK mpg, 17.5 – 15.9 km/l) |
| CO2 emissions (WLTP) | 150-164 g/km |
| Fuel consumption (economy) – urban (NEDC) | 6.9-7.5 l/100 km (34.1 – 31.4 US mpg, 40.9 – 37.7 UK mpg, 14.5 – 13.3 km/l) |
| Fuel consumption (economy) – extra urban (NEDC) | 4.4-4.7 l/100 km (53.5 – 50 US mpg, 64.2 – 60.1 UK mpg, 22.7 – 21.3 km/l) |
| Fuel consumption (economy) – combined (NEDC) | 5.3-5.7 l/100 km (44.4 – 41.3 US mpg, 53.3 – 49.6 UK mpg, 18.9 – 17.5 km/l) |
| CO2 emissions (NEDC) | 140-149 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), Electronically limited |
| Emission standard | Euro 6d |
| Weight-to-power ratio | 5.4 kg/Hp, 185.8 Hp/tonne |
| Weight-to-torque ratio | 2.6 kg/Nm, 382.5 Nm/tonne |
| Gross battery capacity | 0.4 kWh |
| Battery voltage | 48 V |
| Battery technology | Lithium-ion (Li-Ion) |
| Battery location | Under the front hood |
| Electric motor power | 11 Hp |
| Electric motor Torque | 25 Nm (18.44 lb.-ft.) |
| Electric motor location | Front, Longitudinal |
| Power | 340 Hp @ 4400 rpm |
| Torque | 700 Nm @ 1750-2250 rpm (516.29 lb.-ft. @ 1750-2250 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | B57D30B |
| 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 |
| Valvetrain | DOHC |
| Engine oil capacity | 7 l (7.4 US qt | 6.16 UK qt) |
| Coolant | 7.7 l (8.14 US qt | 6.78 UK qt) |
| Kerb Weight | 1830 kg (4034.46 lbs.) |
| Max. weight | 2340 kg (5158.82 lbs.) |
| Max load | 510 kg (1124.36 lbs.) |
| Trunk (boot) space – minimum | 440 l (15.54 cu. ft.) |
| Fuel tank capacity | 59 l (15.59 US gal | 12.98 UK gal) |
| Max. roof load | 75 kg (165.35 lbs.) |
| Permitted trailer load with brakes (12%) | 1800 kg (3968.32 lbs.) |
| Permitted trailer load without brakes | 750 kg (1653.47 lbs.) |
| Permitted towbar download | 75 kg (165.35 lbs.) |
| Length | 4770 mm (187.8 in.) |
| Width | 1852 mm (72.91 in.) |
| Height | 1393 mm (54.84 in.) |
| Wheelbase | 2851 mm (112.24 in.) |
| Front track | 1575 mm (62.01 in.) |
| Rear (Back) track | 1611 mm (63.43 in.) |
| Ride height (ground clearance) | 129 mm (5.08 in.) |
| Drag coefficient (Cd) | 0.28 |
| Minimum turning circle (turning diameter) | 12 m (39.37 ft.) |
| Drivetrain Architecture | ICE and electric motor drive all four wheels, operating in mixed mode. |
| Drive wheel | All wheel drive (4×4) |
| Number of gears and type of gearbox | 8 gears, automatic transmission Steptronic |
| Front suspension | Spring Strut, Transverse stabilizer |
| Rear suspension | Independent multi-link spring suspension with stabilizer |
| 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 | Front wheel tires: 225/45 R18, Rear wheel tires: 255/40 R18 |
| Wheel rims size | Front wheel rims: 7.5J x 18, Rear wheel rims: 8.5J x 18 |
Powertrain & Engine Architecture
The heart of the M440d is BMW’s B57D30B 3.0-liter inline-six diesel engine. This engine benefits from a sophisticated common-rail direct injection system and a twin-scroll turbocharger, delivering a substantial 340 horsepower at 4400 rpm and a robust 700 Nm (516 lb-ft) of torque between 1750 and 2250 rpm. The mild hybrid system, utilizing a 48V lithium-ion battery and an integrated starter generator, provides an additional 11 horsepower and 25 Nm (18 lb-ft) of torque, aiding in smoother starts, improved fuel efficiency, and reduced engine noise. The engine’s high compression ratio of 16.5:1 is typical for modern diesel engines, maximizing efficiency. The Steptronic 8-speed automatic transmission is specifically tuned to handle the engine’s torque output and provides smooth, quick shifts.
Driving Characteristics
The M440d xDrive offers a refined and capable driving experience. The combination of the powerful diesel engine and the all-wheel-drive system results in brisk acceleration – 0 to 60 mph in approximately 4.4 seconds. The mild hybrid system contributes to a seamless power delivery, minimizing turbo lag. While not as overtly sporty as the M4, the M440d provides ample power for both highway cruising and spirited driving. The Steptronic transmission offers both automatic and manual shift modes, allowing drivers to tailor the driving experience to their preferences. The xDrive system provides excellent traction in various weather conditions, enhancing stability and control.
Equipment & Trim Levels
The M440d typically came well-equipped as standard. Features included BMW’s iDrive infotainment system with a touchscreen display, navigation, Apple CarPlay and Android Auto compatibility, leather upholstery, power-adjustable front seats with memory function, automatic climate control, and a premium sound system. Optional extras included a head-up display, adaptive cruise control, parking assist, upgraded leather options, and various interior trim packages. The M Sport package was a popular option, adding more aggressive styling cues, sport seats, and a sport-tuned suspension.
Chassis & Braking
The G22 4 Series Coupe features a sophisticated chassis design. The front suspension utilizes a spring strut setup with a transverse stabilizer, while the rear employs an independent multi-link suspension, also with a stabilizer bar. This configuration provides a good balance between comfort and handling. The M440d is equipped with ventilated disc brakes on all four wheels, providing ample stopping power. The ABS (Anti-lock Braking System) and electronic stability control systems further enhance safety and control.
Market Reception & Comparison
The M440d xDrive Steptronic was generally well-received by automotive critics. It was praised for its powerful and efficient engine, comfortable ride, and refined interior. Compared to the 440i (gasoline variant), the M440d offered superior fuel economy and a broader torque curve, making it ideal for long-distance driving. However, the 440i was often preferred by those seeking a more engaging and sporty driving experience. The M440d also stood out against other diesel-powered coupes in its class, offering a compelling combination of performance, luxury, and efficiency.
Legacy
The B57 engine family, including the B57D30B found in the M440d, has proven to be remarkably reliable. While diesel engines generally require diligent maintenance, these engines are known for their durability and longevity. The mild hybrid system has also demonstrated good reliability. On the used car market, the M440d xDrive Steptronic holds its value well, appealing to buyers seeking a premium coupe with strong performance and good fuel economy. Regular maintenance, including oil changes and adherence to BMW’s service schedule, is crucial for ensuring the long-term reliability of this powertrain.
