The BMW X4 M40i xDrive, produced from December 2019 through 2021 for the US market, represents a performance-oriented variant within the second-generation (G02) X4 series. Positioned as a mid-range to premium offering, it bridges the gap between the base X4 models and the full-fledged X4 M. This Sports Activity Coupe (SAC) aimed to deliver a blend of practicality, luxury, and engaging driving dynamics, appealing to buyers seeking a more spirited alternative to traditional SUVs. The M40i distinguished itself through its potent inline-six engine, standard xDrive all-wheel drive, and a refined automatic transmission.
Technical Specifications
| Brand | BMW |
| Model | X4 |
| Generation | X4 (G02) |
| Type | M40i (382 Hp) xDrive Steptronic (USA) |
| Start of production | December, 2019 |
| End of production | 2021 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | SAC |
| Seats | 5 |
| Doors | 5 |
| Fuel consumption (urban) | 11.2 l/100 km (21 US mpg, 25.2 UK mpg, 8.9 km/l) |
| Fuel consumption (extra urban) | 8.7 l/100 km (27 US mpg, 32.5 UK mpg, 11.5 km/l) |
| Fuel consumption (combined) | 10.2 l/100 km (23.1 US mpg, 27.7 UK mpg, 9.8 km/l) |
| Fuel Type | Petrol (Gasoline) |
| Maximum speed | 209 km/h (129.87 mph) |
| Weight-to-power ratio | 5.1 kg/Hp, 194.8 Hp/tonne |
| Weight-to-torque ratio | 4 kg/Nm, 252.4 Nm/tonne |
| Power | 382 Hp @ 5800-6500 rpm |
| Power per litre | 127.4 Hp/l |
| Torque | 495 Nm @ 1520-4800 rpm (365.09 lb.-ft. @ 1520-4800 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | B58B30O1 |
| Engine displacement | 2998 cm3 (182.95 cu. in.) |
| Number of cylinders | 6 |
| Engine configuration | Inline |
| Compression ratio | 11:1 |
| Number of valves per cylinder | 4 |
| Fuel injection system | Direct injection |
| Engine aspiration | Twin-power turbo, Intercooler |
| Valvetrain | VALVETRONIC |
| Engine oil capacity | 6.5 l (6.87 US qt | 5.72 UK qt) |
| Coolant capacity | 14.8 l (15.64 US qt | 13.02 UK qt) |
| Kerb Weight | 1961 kg (4323.26 lbs.) |
| Trunk (boot) space – minimum | 524 l (18.5 cu. ft.) |
| Trunk (boot) space – maximum | 1430 l (50.5 cu. ft.) |
| Fuel tank capacity | 65 l (17.17 US gal | 14.3 UK gal) |
| Length | 4763 mm (187.52 in.) |
| Width | 1918 mm (75.51 in.) |
| Width including mirrors | 2139 mm (84.21 in.) |
| Height | 1621 mm (63.82 in.) |
| Wheelbase | 2865 mm (112.8 in.) |
| Front track | 1605 mm (63.19 in.) |
| Rear track | 1666 mm (65.59 in.) |
| Front overhang | 871 mm (34.29 in.) |
| Rear overhang | 1026 mm (40.39 in.) |
| Drivetrain Architecture | All wheel drive (4×4). ICE drives all four wheels. |
| Number of gears | 8 |
| Gearbox type | Automatic transmission Steptronic |
| Front brakes | Ventilated discs |
| Rear brakes | Ventilated discs |
| Front tires | 245/50 R19 |
| Rear tires | 245/50 R19 |
| Front wheel rims | 7.5J x 19 |
| Rear wheel rims | 7.5J x 19 |
Powertrain & Engine Architecture
At the heart of the X4 M40i lies BMW’s B58B30O1 3.0-liter inline-six engine. This engine is a member of the modular B-series family, known for its robust construction and sophisticated technology. The B58 utilizes a single, twin-scroll turbocharger with an air-to-air intercooler, delivering a broad torque curve and responsive power delivery. Direct fuel injection, combined with BMW’s VALVETRONIC variable valve timing and variable valve lift, optimizes combustion efficiency and contributes to the engine’s smooth operation. The engine produces 382 horsepower at 5800-6500 rpm and 495 Nm (365 lb-ft) of torque between 1520 and 4800 rpm. The engine is longitudinally mounted, powering all four wheels through BMW’s xDrive all-wheel-drive system.
The transmission is an 8-speed Steptronic automatic, offering both fully automatic operation and manual gear selection via steering wheel-mounted paddles. This transmission is known for its quick and smooth shifts, contributing to the X4 M40i’s overall performance. The xDrive system is primarily rear-biased, enhancing the sporty driving experience while maintaining all-weather capability.
Driving Characteristics
The X4 M40i delivers a noticeably more engaging driving experience compared to the four-cylinder X4 variants. The potent inline-six provides ample power for confident acceleration and effortless highway cruising. The 0-60 mph sprint is typically achieved in around 4.4-4.6 seconds. The automatic transmission is well-tuned, providing quick and seamless gear changes. While not as overtly aggressive as the full M model, the M40i offers a satisfying balance of performance and comfort. The xDrive system provides excellent traction in various conditions, inspiring confidence on both dry and wet roads. The steering is precise and well-weighted, contributing to a connected feel behind the wheel.
Equipment & Trim Levels
The X4 M40i came standard with a comprehensive list of features, including leather upholstery, power-adjustable front seats with memory function, a panoramic sunroof, and a premium sound system. Standard safety features included automatic emergency braking, lane departure warning, and blind-spot monitoring. Optional extras included adaptive cruise control, a head-up display, and upgraded interior trim options. The M40i also featured unique exterior styling cues, such as larger air intakes, a rear diffuser, and M-specific badging.
Chassis & Braking
The X4 M40i utilizes a sophisticated chassis design, featuring a double-jointed front axle and a multi-link rear suspension. The suspension is tuned to provide a balance of comfort and handling. The M40i benefits from a slightly stiffer suspension setup compared to the base X4 models, further enhancing its dynamic capabilities. Braking duties are handled by ventilated discs on all four wheels. The braking system is responsive and provides ample stopping power. The M40i typically features larger brake rotors and calipers compared to the lower-trim X4 models.
Market Reception & Comparison
The X4 M40i was generally well-received by automotive critics, who praised its powerful engine, engaging handling, and luxurious interior. It was often positioned as a compelling alternative to rivals such as the Porsche Macan and the Audi SQ5. Compared to the base X4 models, the M40i offered a significant performance upgrade, justifying its higher price tag. Fuel economy was respectable for a performance SUV, averaging around 23 mpg in combined driving. Reliability reports have been generally positive, with the B58 engine proving to be a durable and dependable unit.
Legacy
The BMW X4 M40i (G02) has established itself as a desirable used car option. The B58 engine is known for its longevity and relatively low maintenance costs, making it an attractive choice for buyers seeking a performance SUV with long-term reliability. The combination of performance, luxury, and practicality continues to appeal to a wide range of buyers in the used car market. The G02 X4 M40i represents a sweet spot in the lineup, offering a significant performance boost over the base models without the higher price and potential maintenance costs associated with the full M variant.
