The BMW X3 (G01) M40d xDrive Steptronic, produced from August 2018 to August 2020, represents a performance-oriented variant within the third generation of the X3 Sports Activity Vehicle (SAV). Positioned as a premium offering, the M40d bridged the gap between the standard X3 models and the full-fledged X3 M. It catered to buyers seeking a blend of luxury, practicality, and strong diesel-powered performance. This model was primarily marketed in Europe and other regions where diesel engines remained popular, offering a compelling alternative to gasoline-powered SUVs.
Technical Specifications
| Brand | BMW |
| Model | X3 |
| Generation | X3 (G01) |
| Type (Engine) | M40d (326 Hp) xDrive Steptronic |
| Start of production | August, 2018 |
| End of production | August, 2020 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | SAV |
| Seats | 5 |
| Doors | 5 |
| Fuel consumption (economy) – urban | 7.2-7.4 l/100 km (32.7 – 31.8 US mpg, 39.2 – 38.2 UK mpg, 13.9 – 13.5 km/l) |
| Fuel consumption (economy) – extra urban | 5.8-6.1 l/100 km (40.6 – 38.6 US mpg, 48.7 – 46.3 UK mpg, 17.2 – 16.4 km/l) |
| Fuel consumption (economy) – combined | 6.4-6.5 l/100 km (36.8 – 36.2 US mpg, 44.1 – 43.5 UK mpg, 15.6 – 15.4 km/l) |
| CO2 emissions | 169-172 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-TEMP |
| Weight-to-power ratio | 5.8 kg/Hp, 172 Hp/tonne |
| Weight-to-torque ratio | 2.8 kg/Nm, 358.8 Nm/tonne |
| Power | 326 Hp @ 4400 rpm |
| Power per litre | 108.9 Hp/l |
| Torque | 680 Nm @ 1750-2750 rpm (501.54 lb.-ft. @ 1750-2750 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 |
| Engine oil capacity | 6.5 l (6.87 US qt | 5.72 UK qt) |
| Coolant | 10 l (10.57 US qt | 8.8 UK qt) |
| Kerb Weight | 1895 kg (4177.76 lbs.) |
| Max. weight | 2550 kg (5621.79 lbs.) |
| Max load | 655 kg (1444.03 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 (Back) track | 1594 mm (62.76 in.) |
| Ride height (ground clearance) | 204 mm (8.03 in.) |
| Drag coefficient (Cd) | 0.32 |
| Minimum turning circle (turning diameter) | 12.1 m (39.7 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 | 245/45 R20; 275/40 R20 |
| Wheel rims size | 8J x 20; 9.5J x 20 |
Powertrain & Engine Architecture
The heart of the X3 M40d is the BMW B57D30B, a 3.0-liter inline-six diesel engine. This engine is a member of the modular BMW engine family, known for its robust construction and advanced technology. It utilizes a sophisticated diesel commonrail fuel injection system, delivering fuel at extremely high pressures for optimized combustion. The B57 features a twin-scroll turbocharger with variable geometry turbine (VGT) technology, enhancing both low-end torque and high-end power. An intercooler further cools the intake air, increasing density and improving efficiency. The engine produces 326 horsepower at 4,400 rpm and a substantial 680 Nm (501.54 lb-ft) of torque between 1,750 and 2,750 rpm. Paired with the engine is the ZF 8HP80 eight-speed automatic transmission, marketed by BMW as “Steptronic.” This transmission is renowned for its smooth shifts, quick response, and efficiency. The xDrive all-wheel-drive system intelligently distributes power between the front and rear axles, providing optimal traction in various conditions.
Driving Characteristics
The X3 M40d delivers a distinctly different driving experience compared to lower-powered X3 variants. The abundant torque from the diesel engine provides strong acceleration from low speeds, making it effortless for everyday driving and overtaking maneuvers. The 0-60 mph sprint takes approximately 4.7 seconds. While not as rev-happy as a gasoline engine, the B57 offers a broad powerband, ensuring ample power is available throughout the rev range. The Steptronic transmission contributes to a refined driving experience, with smooth and precise gear changes. Compared to the X3 30i (gasoline), the M40d prioritizes torque and fuel efficiency over outright horsepower. It also offers a more relaxed and refined driving experience than the higher-performance X3 M, which focuses on track-oriented handling.
Equipment & Trim Levels
The M40d trim typically included a generous array of standard features. Interior appointments included sport seats upholstered in premium leather, often with contrasting stitching. The dashboard featured a modern design with a large infotainment screen, typically running BMW’s iDrive system. Standard equipment often included a panoramic sunroof, automatic climate control, and a premium sound system. Optional extras included adaptive cruise control, a head-up display, and various driver-assistance systems. The M40d also benefited from M-specific styling cues, such as unique exterior trim, M Sport brakes, and an M Sport steering wheel.
Chassis & Braking
The X3 M40d featured a robust chassis designed to handle the engine’s power and provide a comfortable ride. The front suspension utilized a double wishbone setup, while the rear employed an independent multi-link suspension. The suspension was tuned to provide a balance between sporty handling and ride comfort. Brakes consisted of ventilated discs on all four wheels, providing ample stopping power. The M40d often included larger brake rotors and calipers compared to lower-spec X3 models. The xDrive all-wheel-drive system contributed to enhanced stability and handling, particularly in adverse weather conditions.
Market Reception & Comparison
The X3 M40d was generally well-received by automotive critics. It was praised for its strong performance, refined driving experience, and luxurious interior. Critics noted the engine’s impressive torque and fuel efficiency. Compared to the X3 30i, the M40d offered significantly more performance, albeit at a higher price point. Against competitors like the Audi SQ5 and Porsche Macan Diesel (where available), the X3 M40d offered a compelling combination of performance, luxury, and practicality. Fuel economy was a strong point, with combined figures ranging from 36.2 to 36.8 US mpg, making it a relatively efficient option in its class.
Legacy
The B57 engine, found in the X3 M40d, has proven to be a reliable and durable powertrain. While diesel engines have faced increased scrutiny in recent years, the B57 has generally maintained a good reputation for longevity. On the used car market, the X3 M40d holds its value relatively well, due to its desirable combination of performance, luxury, and practicality. Maintenance costs are generally comparable to other BMW models, but it’s important to ensure regular servicing and address any potential issues promptly. The X3 M40d represents a sweet spot in the G01 X3 lineup, offering a compelling blend of performance and efficiency for buyers seeking a premium diesel-powered SUV.
