The BMW X3 G01 M40d, produced from 2020 to 2021, represents a performance-oriented variant within the third generation of the X3 Sports Activity Vehicle (SAV). Positioned as a near-top-of-the-line model, it bridges the gap between the more mainstream X3 trims and the full-fledged X3 M. This variant is notable for its potent diesel engine, mild-hybrid technology, and standard xDrive all-wheel-drive system, aimed at delivering a blend of performance, efficiency, and all-weather capability. The G01 generation X3, built on the CLAR platform, aimed to reduce weight and improve driving dynamics compared to its predecessor.
Technical Specifications
| Brand | BMW |
| Model | X3 |
| Generation | X3 (G01) |
| 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 | SAV |
| Seats | 5 |
| Doors | 5 |
| Fuel consumption (urban) | 6.9-7.2 l/100 km (34.1 – 32.7 US mpg) |
| Fuel consumption (extra urban) | 4.9-5.2 l/100 km (48 – 45.2 US mpg) |
| Fuel consumption (combined) | 5.6-6.0 l/100 km (42 – 39.2 US mpg) |
| CO2 emissions | 148-157 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 | 2560 kg (5643.83 lbs.) |
| Max load | 540 kg (1190.5 lbs.) |
| Trunk (boot) space – minimum | 550 l (19.42 cu. ft.) |
| Trunk (boot) space – maximum | 1600 l (56.5 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 | 4716 mm (185.67 in.) |
| Width | 1897 mm (74.69 in.) |
| Height | 1676 mm (65.98 in.) |
| Wheelbase | 2864 mm (112.76 in.) |
| Front track | 1615 mm (63.58 in.) |
| Rear track | 1594 mm (62.76 in.) |
| Ride height (ground clearance) | 204 mm (8.03 in.) |
| Drag coefficient (Cd) | 0.31 |
| Minimum turning circle | 12.1 m (39.7 ft.) |
| Front suspension | Double wishbone |
| Rear suspension | Independent multi-link suspension |
| Front brakes | Ventilated discs |
| Rear brakes | Ventilated discs |
| Gearbox | 8 gears, automatic transmission Steptronic |
Powertrain & Engine Architecture
The heart of the X3 M40d is the BMW B57D30B, a 3.0-liter inline-six diesel engine. This engine utilizes a sophisticated common-rail direct injection system, delivering fuel at extremely high pressures for optimized combustion. A twin-turbocharger setup, employing both a conventional turbocharger and a smaller, variable geometry turbocharger, minimizes turbo lag and provides a broad torque curve. The engine also features an intercooler to cool the intake air, further enhancing performance. The ‘D30B’ designation indicates a higher output variant of the B57 family. The mild-hybrid system, incorporating a 48V starter-generator, provides a small power boost (11 hp) and enables features like extended start-stop operation and regenerative braking, contributing to improved fuel economy. The Steptronic 8-speed automatic transmission is standard, offering smooth and quick shifts. It’s programmed for both comfort and performance, adapting to the driver’s style.
Driving Characteristics
The X3 M40d delivers strong acceleration, with a 0-60 mph time of around 4.7 seconds. The engine’s substantial 700 Nm (516 lb-ft) of torque, available from a low 1750 rpm, provides effortless overtaking and a responsive feel in everyday driving. The automatic transmission is well-matched to the engine, providing seamless gear changes. Compared to the petrol-powered X3 M40i, the M40d offers superior fuel economy and a more relaxed driving experience, although it lacks the high-revving excitement of the gasoline engine. The xDrive all-wheel-drive system provides excellent traction in all conditions, enhancing stability and confidence. The steering is precise and well-weighted, contributing to a sporty feel.
Equipment & Trim Levels
The M40d trim typically included a high level of standard equipment. This included leather upholstery, power-adjustable front seats with memory function, a panoramic sunroof, and a premium sound system. BMW’s iDrive infotainment system with a large touchscreen display was also standard, offering navigation, connectivity, and various vehicle settings. Optional extras included adaptive cruise control, a head-up display, and various driver-assistance systems. Exterior styling cues included M Sport styling elements, such as unique front and rear bumpers, side skirts, and larger alloy wheels.
Chassis & Braking
The X3 M40d features a double-wishbone front suspension and an independent multi-link rear suspension, tuned for a balance of comfort and handling. The suspension setup is slightly firmer than that of the standard X3 models, reflecting the M40d’s performance focus. Ventilated disc brakes are fitted on all four wheels, providing strong stopping power. The braking system is enhanced by ABS, electronic brakeforce distribution, and brake assist. The xDrive all-wheel-drive system utilizes a multi-plate clutch to distribute torque between the front and rear axles, optimizing traction and stability.
Market Reception & Comparison
The X3 M40d was generally well-received by automotive critics. It was praised for its powerful engine, refined ride, and practical interior. Compared to the X3 30d, the M40d offered a significant performance upgrade, but at a higher price point. Against competitors like the Audi SQ5 TDI and the Porsche Macan Diesel, the X3 M40d offered a compelling combination of performance, luxury, and value. Fuel economy was a strong point, with combined figures around 39-42 mpg, making it a relatively efficient performance SUV.
Legacy
The B57 engine family, including the B57D30B found in the X3 M40d, has proven to be remarkably reliable. While diesel engines can be susceptible to issues with the diesel particulate filter (DPF) and emissions control systems, the B57 has generally demonstrated good durability. On the used car market, the X3 M40d holds its value well, due to its performance and reputation for reliability. However, potential buyers should ensure that the vehicle has been properly maintained, with regular servicing and DPF regeneration. The X3 M40d represents a sweet spot in the G01 X3 lineup, offering a compelling blend of performance, luxury, and efficiency.
