Technical Specifications
| Brand | BMW |
| Model | X4 |
| Generation | X4 (G02) |
| Type (Engine) | M40i (354 Hp) xDrive Steptronic |
| Start of production | August, 2018 |
| End of production | November, 2019 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | SAC |
| Seats | 5 |
| Doors | 5 |
| Fuel consumption (urban) | 11.3-11.5 l/100 km (20.8 – 20.5 US mpg) |
| Fuel consumption (extra urban) | 7.6-7.7 l/100 km (30.9 – 30.5 US mpg) |
| Fuel consumption (combined) | 9.0-9.1 l/100 km (26.1 – 25.8 US mpg) |
| CO2 emissions | 205-206 g/km |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 100 km/h | 4.8 sec |
| Acceleration 0 – 62 mph | 4.8 sec |
| Acceleration 0 – 60 mph | 4.6 sec |
| Maximum speed | 250 km/h (155.34 mph) |
| Emission standard | Euro 6 |
| Weight-to-power ratio | 5.2 kg/Hp, 194 Hp/tonne |
| Weight-to-torque ratio | 3.7 kg/Nm, 274 Nm/tonne |
| Power | 354 Hp @ 5500-6500 rpm |
| Power per litre | 118.1 Hp/l |
| Torque | 500 Nm @ 1550-4500 rpm (368.78 lb.-ft. @ 1550-4500 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | B58B30A |
| Engine displacement | 2998 cm3 (182.95 cu. in.) |
| Number of cylinders | 6 |
| Engine configuration | Inline |
| Cylinder Bore | 82 mm (3.23 in.) |
| Piston Stroke | 94.6 mm (3.72 in.) |
| Compression ratio | 11:1 |
| Number of valves per cylinder | 4 |
| Fuel injection system | Direct injection |
| Engine aspiration | Twin-power turbo, Intercooler |
| Engine oil capacity | 6.5 l (6.87 US qt | 5.72 UK qt) |
| Coolant | 13.5 l (14.27 US qt | 11.88 UK qt) |
| Kerb Weight | 1825 kg (4023.44 lbs.) |
| Max. weight | 2530 kg (5577.7 lbs.) |
| Max load | 705 kg (1554.26 lbs.) |
| Trunk (boot) space – minimum | 525 l (18.54 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) |
| Max. roof load | 100 kg (220.46 lbs.) |
| Permitted trailer load with brakes (12%) | 2000 kg (4409.25 lbs.) |
| Permitted trailer load without brakes | 750 kg (1653.47 lbs.) |
| Permitted towbar download | 100 kg (220.46 lbs.) |
| Length | 4733 mm (186.34 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 (Back) track | 1624 mm (63.94 in.) |
| Ride height (ground clearance) | 204 mm (8.03 in.) |
| Drag coefficient (Cd) | 0.30 |
| Minimum turning circle (turning diameter) | 12.1 m (39.7 ft.) |
| Wading depth | 500 mm (19.69 in.) |
| 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 |
The BMW X4 M40i xDrive Steptronic, produced from August 2018 to November 2019, represents a performance-oriented variant within the second generation (G02) of the X4 Sports Activity Coupe (SAC). Positioned as a mid-to-high range trim, the M40i offered a significant step up in power and driving dynamics compared to the base X4 models, bridging the gap between the standard trims and the full-fledged X4 M. It aimed to appeal to buyers seeking a blend of practicality, sporty styling, and engaging performance in a luxury crossover package.
Powertrain & Engine Architecture
The heart of the X4 M40i is BMW’s B58B30A 3.0-liter inline-six engine. This engine is a member of the modular B-series engine family, known for its robust construction and high output. The B58 utilizes a single, twin-scroll turbocharger with intercooling, direct fuel injection, and Double-VANOS variable valve timing for both intake and exhaust camshafts. This combination delivers a flat torque curve and responsive power delivery. The engine produces 354 horsepower at 5500-6500 rpm and 368 lb-ft of torque from 1550-4500 rpm. The engine is longitudinally mounted at the front of the vehicle. The xDrive all-wheel-drive system is paired with an 8-speed Steptronic automatic transmission. This transmission features a torque converter and allows for both fully automatic operation and manual gear selection via steering wheel-mounted paddles. The Steptronic transmission is tuned for both efficiency and performance, with quick and smooth shifts.
Driving Characteristics
The X4 M40i offers a noticeably more engaging driving experience than the lower-trim X4 models. The potent engine and responsive transmission provide brisk acceleration, with a 0-60 mph time of around 4.6 seconds. The xDrive all-wheel-drive system provides excellent traction in various conditions, enhancing stability and confidence. The suspension is tuned to be firmer than the standard X4, reducing body roll and improving handling. While not as track-focused as the X4 M, the M40i strikes a good balance between comfort and performance. The 8-speed automatic transmission is well-programmed, offering smooth shifts and quick downshifts when needed. The gear ratios are optimized for both acceleration and highway cruising. Compared to a manual transmission, the automatic prioritizes ease of use and consistent performance, though it may slightly diminish driver engagement.
Equipment & Trim Levels
The M40i trim came standard with a generous array of features. Interior appointments typically included sport seats upholstered in SensaTec leatherette (optional Vernasca leather was available), aluminum interior trim, and a sport steering wheel. Standard technology included BMW’s iDrive infotainment system with a 12.3-inch touchscreen display, navigation, Apple CarPlay compatibility, and a premium Harman Kardon sound system. Optional extras included adaptive cruise control, a head-up display, panoramic sunroof, and various driver-assistance systems. The exterior featured unique M-specific styling cues, such as a more aggressive front fascia, side skirts, and a rear diffuser.
Chassis & Braking
The X4 M40i utilizes a robust chassis with a double-wishbone front suspension and an independent multi-link rear suspension. The suspension is specifically tuned for the M40i to provide a more sporty and controlled ride. Brakes consist of ventilated discs at all four corners, providing ample stopping power. The M40i typically featured larger brake rotors and calipers compared to the base X4 models. The steering system is an electric power-assisted rack-and-pinion setup, offering precise and responsive steering feel. The xDrive all-wheel-drive system intelligently distributes torque between the front and rear axles based on driving conditions, maximizing traction and stability.
Market Reception & Comparison
The X4 M40i was generally well-received by automotive critics. It was praised for its powerful engine, engaging handling, and luxurious interior. Critics noted that it offered a compelling alternative to traditional performance SUVs, providing a blend of practicality and driving enjoyment. Compared to the X4 30i, the M40i offered a significant performance upgrade, but at a higher price point. Fuel economy was slightly lower than the 30i due to the larger engine. Compared to the X4 M, the M40i offered a more comfortable ride and a lower price, but lacked the ultimate performance and track-focused features of the M model.
Legacy
The B58 engine powering the X4 M40i has proven to be a reliable and durable powerplant. While some early B58 engines experienced issues with oil leaks, these were largely addressed with updated gaskets and seals. The 8-speed Steptronic transmission has also proven to be generally reliable. On the used car market, the X4 M40i holds its value relatively well due to its performance and desirable features. Maintenance costs are comparable to other BMW models, with routine servicing including oil changes, brake replacements, and tire rotations. The X4 M40i remains a popular choice for buyers seeking a sporty and luxurious crossover SUV.
