The BMW X4 M40d (G02), produced from 2020 to 2021, represents a performance-oriented variant within the second generation of the X4 Sports Activity Coupe. Positioned as a mid-to-high range offering, it combined a potent diesel engine with mild-hybrid technology and BMW’s xDrive all-wheel-drive system. This model aimed to deliver a blend of luxury, practicality, and dynamic driving characteristics, appealing to buyers seeking a sporty SUV experience. It sits within the G02 X4 generation, sharing its platform with the X3, but distinguished by its sloping roofline and more aggressive styling.
Technical Specifications
| Brand | BMW |
| Model | X4 |
| Generation | X4 (G02) |
| Type (Engine) | M40d (340 Hp) Mild Hybrid xDrive Steptronic |
| Start of production | 2020 |
| End of production | 2021 |
| Powertrain Architecture | MHEV (Mild Hybrid Electric Vehicle) |
| Body type | SAC (Sports Activity Coupe) |
| Seats | 5 |
| Doors | 5 |
| Fuel consumption (urban) | 6.9-7.2 l/100 km (34.1 – 32.7 US mpg) |
| Fuel consumption (extra urban) | 4.8-5.2 l/100 km (49 – 45.2 US mpg) |
| Fuel consumption (combined) | 5.6-5.9 l/100 km (42 – 39.9 US mpg) |
| CO2 emissions | 147-156 g/km |
| Fuel Type | Diesel |
| Acceleration 0 – 100 km/h | 4.9 sec |
| Acceleration 0 – 62 mph | 4.9 sec |
| Acceleration 0 – 60 mph | 4.7 sec |
| Maximum speed | 250 km/h (155.34 mph) |
| Emission standard | EURO 6d |
| Weight-to-power ratio | 5.9 kg/Hp |
| Weight-to-torque ratio | 2.9 kg/Nm |
| Gross battery capacity | 0.528 kWh |
| Electric motor power | 11 Hp |
| Power | 340 Hp @ 4400 rpm |
| Torque | 700 Nm @ 1750-2250 rpm (516.29 lb.-ft.) |
| 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 |
| Engine oil capacity | 6.5 l (6.87 US qt | 5.72 UK qt) |
| Coolant capacity | 10 l (10.57 US qt | 8.8 UK qt) |
| Kerb Weight | 2020 kg (4453.34 lbs.) |
| Max. weight | 2555 kg (5632.81 lbs.) |
| Max load | 535 kg (1179.47 lbs.) |
| Trunk (boot) space – minimum | 525 l (18.54 cu. ft.) |
| Trunk (boot) space – maximum | 1430 l (50.5 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%) | 2400 kg (5291.09 lbs.) |
| Permitted trailer load without brakes | 750 kg (1653.47 lbs.) |
| Permitted towbar download | 100 kg (220.46 lbs.) |
| Length | 4752 mm (187.09 in.) |
| Width | 1938 mm (76.3 in.) |
| Height | 1621 mm (63.82 in.) |
| Wheelbase | 2864 mm (112.76 in.) |
| Front track | 1615 mm (63.58 in.) |
| Rear track | 1624 mm (63.94 in.) |
| Ride height (ground clearance) | 204 mm (8.03 in.) |
| Drag coefficient (Cd) | 0.30 |
| Minimum turning circle | 12.1 m (39.7 ft.) |
| Front tire size | 245/45 R20 103W XL |
| Rear tire size | 275/40 R20 106W XL |
| Front wheel rims | 8J x 20 |
| Rear wheel rims | 9.5J x 20 |
| Gears | 8 |
| Gearbox type | Automatic (Steptronic) |
INTRODUCTION
The BMW X4 M40d (G02) debuted in 2020 as a key component of the updated X4 lineup. Built on the flexible UKL2 platform shared with the X3, the M40d distinguished itself through its powerful diesel engine and mild-hybrid assistance. This variant aimed to bridge the gap between the more economical X4 models and the high-performance M variant, offering a compelling combination of efficiency and spirited driving. The G02 generation represented a significant evolution for the X4, with a more refined interior, updated technology, and a bolder exterior design compared to its predecessor.
Powertrain & Engine Architecture
At the heart of the X4 M40d lies the B57D30B, a 3.0-liter inline-six diesel engine. This engine benefits from BMW’s extensive experience in diesel technology, featuring a sophisticated common-rail direct injection system operating at extremely high pressures. The B57 utilizes a variable geometry turbocharger (VGT) and an additional turbocharger, creating a twin-turbo setup for enhanced responsiveness and power delivery across the rev range. The mild-hybrid system, a 48V setup, adds a small electric motor that provides a power boost during acceleration and enables smoother start-stop operation. This system doesn’t allow for electric-only driving but contributes to improved fuel efficiency. The engine is paired with BMW’s eight-speed Steptronic automatic transmission, known for its quick and smooth shifts. This transmission is programmed for both comfort and performance, adapting to the driver’s style.
Driving Characteristics
The X4 M40d delivers a noticeably different driving experience compared to lower-powered X4 variants. The 700 Nm (516 lb-ft) of torque, available from a low 1750 rpm, provides strong acceleration in any gear. The mild-hybrid system contributes to a near-instantaneous response from a standstill. While not as overtly sporty as the full-fledged X4 M, the M40d offers a confident and engaging driving experience. The xDrive all-wheel-drive system provides excellent traction in various conditions, and the suspension is tuned to balance comfort and handling. The eight-speed automatic transmission is well-matched to the engine, providing seamless gear changes and contributing to the car’s overall refinement. Compared to the petrol-powered X4 M40i, the M40d offers superior fuel economy and a broader torque curve, making it a more practical choice for long-distance driving.
Equipment & Trim Levels
The X4 M40d typically came well-equipped as standard. Interior features included leather upholstery, power-adjustable front seats with memory function, a premium sound system, and BMW’s iDrive infotainment system with a large touchscreen display. Standard safety features included automatic emergency braking, lane departure warning, and parking sensors. Optional extras included a head-up display, adaptive cruise control, panoramic sunroof, and upgraded interior trim options. The M Sport package was a popular option, adding unique exterior styling elements, sport seats, and an M Sport steering wheel. The overall interior ambiance was luxurious and modern, reflecting BMW’s commitment to quality and craftsmanship.
Chassis & Braking
The X4 M40d features a double-wishbone front suspension and an independent multi-link rear suspension, providing a comfortable and controlled ride. The suspension is tuned to handle the increased power and torque of the M40d engine. The braking system consists of ventilated discs on all four wheels, providing ample stopping power. The M Sport brakes, available as an option, offered even greater stopping performance. The xDrive all-wheel-drive system utilizes a multi-plate clutch to distribute torque between the front and rear axles, optimizing traction and stability. The steering is precise and well-weighted, providing a connected feel to the driver.
Market Reception & Comparison
The X4 M40d was generally well-received by automotive critics. It was praised for its powerful engine, refined ride, and luxurious interior. Reviewers noted that the M40d offered a compelling alternative to traditional petrol-powered performance SUVs, providing excellent fuel economy without sacrificing driving enjoyment. Compared to the X4 20d and 30d models, the M40d offered a significant performance upgrade, but at a higher price point. Against competitors like the Audi Q5 TDI and Porsche Macan Diesel, the X4 M40d held its own, offering a competitive blend of performance, luxury, and technology.
Legacy
The BMW X4 M40d (G02) represents a successful attempt to combine diesel power with performance and efficiency in a stylish SUV package. The B57 engine has proven to be a reliable and durable unit, and the mild-hybrid system has contributed to improved fuel economy. On the used car market, the X4 M40d remains a desirable option for buyers seeking a sporty and luxurious SUV. Maintenance costs are generally comparable to other BMW models, and the availability of parts is good. The G02 X4 M40d solidified BMW’s position as a leader in the premium SUV segment, offering a compelling alternative to traditional petrol-powered vehicles.
