The BMW X4 (G02) 30d, produced from 2020 to 2021, represents a compelling blend of performance, efficiency, and practicality within the luxury compact SUV segment. Positioned as a mid-range offering in the G02 X4 lineup, it slots between the entry-level 20d and the higher-performance M40i models. This variant is characterized by its 3.0-liter inline-six diesel engine, mild hybrid technology, and xDrive all-wheel-drive system paired with an 8-speed Steptronic automatic transmission. The X4, as a “Sports Activity Coupe” (SAC), aimed to provide a more dynamically styled alternative to traditional SUVs, appealing to buyers seeking a sportier driving experience without sacrificing the versatility of a crossover.
Technical Specifications
| Brand | BMW |
| Model | X4 |
| Generation | X4 (G02) |
| Type (Engine) | 30d (286 Hp) Mild Hybrid xDrive Steptronic |
| Start of production | 2020 |
| End of production | 2021 |
| Powertrain Architecture | MHEV (Mild Hybrid Electric Vehicle) |
| Body type | SAC |
| Seats | 5 |
| Doors | 5 |
| Fuel consumption (urban) | 6.3-6.7 l/100 km (37.3 – 35.1 US mpg, 44.8 – 42.2 UK mpg, 15.9 – 14.9 km/l) |
| Fuel consumption (extra urban) | 4.5-4.9 l/100 km (52.3 – 48 US mpg, 62.8 – 57.6 UK mpg, 22.2 – 20.4 km/l) |
| Fuel consumption (combined) | 5.1-5.6 l/100 km (46.1 – 42 US mpg, 55.4 – 50.4 UK mpg, 19.6 – 17.9 km/l) |
| CO2 emissions | 136-146 g/km |
| Fuel Type | Diesel |
| Acceleration 0 – 100 km/h | 5.7 sec |
| Acceleration 0 – 62 mph | 5.7 sec |
| Acceleration 0 – 60 mph | 5.4 sec |
| Maximum speed | 245 km/h (152.24 mph) |
| Emission standard | EURO 6d |
| Weight-to-power ratio | 6.7 kg/Hp, 148.2 Hp/tonne |
| Weight-to-torque ratio | 3 kg/Nm, 336.8 Nm/tonne |
| Gross battery capacity | 0.528 kWh |
| Electric motor power | 11 Hp |
| Power | 286 Hp @ 4000 rpm |
| Torque | 650 Nm @ 1500-2500 rpm (479.42 lb.-ft. @ 1500-2500 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 capacity | 10 l (10.57 US qt | 8.8 UK qt) |
| Kerb Weight | 1930 kg (4254.92 lbs.) |
| Max. weight | 2530 kg (5577.7 lbs.) |
| Max load | 600 kg (1322.77 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 | 1918 mm (75.51 in.) |
| Height | 1621 mm (63.82 in.) |
| Wheelbase | 2864 mm (112.76 in.) |
| Front track | 1620 mm (63.78 in.) |
| Rear track | 1666 mm (65.59 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 suspension | Double wishbone |
| Rear suspension | Independent multi-link suspension |
| Front brakes | Ventilated discs |
| Rear brakes | Ventilated discs |
| Gearbox | 8 gears, automatic transmission Steptronic |
INTRODUCTION
The G02 generation BMW X4, launched in 2018, represented the second iteration of BMW’s coupe-like SUV. The 30d variant, introduced in 2020, quickly became a popular choice for European buyers seeking a balance between performance and fuel economy. Utilizing BMW’s modular architecture, the X4 shares its platform with the X3, but distinguishes itself through its sloping roofline and more aggressive styling. The 30d specifically targeted customers who desired the refinement of a six-cylinder diesel engine, coupled with the convenience of an automatic transmission and all-wheel drive. It served as a practical daily driver capable of long-distance journeys, while still offering a degree of sporting character.
Powertrain & Engine Architecture
At the heart of the X4 30d lies the B57D30B, a 3.0-liter inline-six diesel engine. This engine is a cornerstone of BMW’s diesel lineup, known for its smoothness, durability, and strong torque output. The B57 features a common-rail direct injection system operating at extremely high pressures (2,500 bar) for optimized combustion. It’s equipped with a variable geometry turbocharger and an intercooler to enhance power and efficiency. The mild hybrid system, a 48V setup, incorporates a starter-generator that provides a power boost during acceleration and enables smoother start-stop operation. This system also allows for coasting with the engine switched off, further improving fuel economy. The engine is longitudinally mounted, driving all four wheels through BMW’s xDrive all-wheel-drive system. The 8-speed Steptronic automatic transmission is a torque-converter type, offering smooth and responsive gear changes. It features adaptive shift programs that adjust to the driver’s style and road conditions.
Driving Characteristics
The X4 30d delivers a refined and capable driving experience. The 650 Nm (479 lb-ft) of torque available from 1500-2500 rpm provides strong acceleration in everyday driving situations. The 0-60 mph sprint takes approximately 5.4 seconds, making it a brisk performer. While not as overtly sporty as the M40i, the 30d offers ample power for overtaking and highway cruising. The Steptronic transmission is well-matched to the engine, providing seamless gear changes and contributing to a relaxed driving experience. The xDrive system ensures excellent traction in all weather conditions, enhancing stability and confidence. The suspension setup, tuned for a balance between comfort and handling, provides a reasonably compliant ride without sacrificing too much body control. Compared to the 20d, the 30d offers significantly more power and torque, resulting in noticeably quicker acceleration and more effortless performance. It also feels more refined and less strained during highway driving.
Equipment & Trim Levels
The X4 30d typically came well-equipped as standard. Common features included BMW’s iDrive infotainment system with a touchscreen display, navigation, Apple CarPlay and Android Auto compatibility, leather upholstery, automatic climate control, and a suite of driver-assistance systems such as lane departure warning and collision warning. Optional extras included a panoramic sunroof, upgraded sound system, adaptive cruise control, head-up display, and various customization options for interior trim and exterior styling. Trim levels varied by market, but generally offered packages that bundled popular options together. The interior design emphasized a driver-focused layout with high-quality materials and a modern aesthetic.
Chassis & Braking
The X4 30d utilizes a robust chassis with a double-wishbone front suspension and an independent multi-link rear suspension. This setup provides a good balance of ride comfort and handling precision. The steering is precise and well-weighted, offering good feedback to the driver. Braking performance is strong, with ventilated discs on all four wheels and standard ABS (Anti-lock Braking System). The X4 30d’s weight of around 1930 kg (4255 lbs) is managed effectively by the suspension and braking systems, providing a stable and controlled driving experience. The standard tire size is typically 225/60 R18, although larger wheels and tires were available as options.
Market Reception & Comparison
The BMW X4 30d was generally well-received by automotive critics. It was praised for its refined engine, comfortable ride, and practical interior. The mild hybrid system was also noted for its contribution to improved fuel economy. Compared to competitors such as the Audi Q5 and Mercedes-Benz GLC, the X4 30d was often seen as offering a more engaging driving experience. However, some critics noted that the sloping roofline compromised rear headroom and cargo space compared to more traditionally shaped SUVs. Fuel economy figures of 5.1-5.6 l/100 km (46.1-42 US mpg) were competitive for its class. Reliability reports generally indicated good long-term reliability, although diesel particulate filter issues could occur with infrequent long-distance driving.
Legacy
The B57 engine family, including the B57D30B found in the X4 30d, has proven to be remarkably durable and reliable. These engines are known to withstand high mileage with proper maintenance. On the used car market, the X4 30d remains a desirable option for buyers seeking a premium SUV with a strong diesel engine. While newer models with more advanced technology have emerged, the G02 X4 30d continues to offer a compelling combination of performance, efficiency, and practicality. Its blend of sporty styling and everyday usability ensures its continued appeal to a wide range of buyers.
