The BMW X6 (G06) 40i, produced from December 2020 to February 2023, represents a significant iteration of BMW’s Sports Activity Coupe (SAC). This variant, equipped with a 3.0-liter inline-six engine and a 48-volt mild hybrid system paired with an eight-speed Steptronic automatic transmission, occupies a mid-range position within the G06 X6 lineup, offering a balance between performance, efficiency, and luxury. It aimed to appeal to buyers seeking a more engaging driving experience than the four-cylinder models, without the outright performance focus of the M50i. The G06 generation marked a substantial evolution in design and technology for the X6, building upon the success of its predecessors while incorporating BMW’s latest innovations.
Technical Specifications
| Brand | BMW |
| Model | X6 |
| Generation | X6 (G06) |
| Type (Engine) | 40i (333 Hp) Mild Hybrid xDrive Steptronic |
| Start of production | December, 2020 |
| End of production | February, 2023 |
| Powertrain Architecture | MHEV (Mild Hybrid Electric Vehicle) |
| Body type | SAC |
| Seats | 5 |
| Doors | 5 |
| Combined fuel consumption (WLTP) | 8.8-10.3 l/100 km (26.7 – 22.8 US mpg) |
| CO2 emissions (WLTP) | 202-235 g/km |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 100 km/h | 5.7 sec |
| Acceleration 0 – 62 mph | 5.7 sec |
| Acceleration 0 – 60 mph | 5.4 sec |
| Maximum speed | 248 km/h (154.1 mph) |
| Emission standard | Euro 6d |
| Power | 333 Hp @ 5500-6250 rpm |
| Torque | 450 Nm @ 1600-4800 rpm (331.9 lb.-ft. @ 1600-4800 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | B58B30C |
| 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 |
| Fuel injection system | Direct injection |
| Engine aspiration | Twin-power turbo, Intercooler |
| Valvetrain | VALVETRONIC, Double-VANOS |
| Engine oil capacity | 6.5 l (6.87 US qt | 5.72 UK qt) |
| Coolant | 12.6 l (13.31 US qt | 11.09 UK qt) |
| Kerb Weight | 2095 kg (4618.68 lbs.) |
| Max. weight | 2840 kg (6261.13 lbs.) |
| Max load | 745 kg (1642.44 lbs.) |
| Trunk (boot) space – minimum | 580 l (20.48 cu. ft.) |
| Trunk (boot) space – maximum | 1530 l (54.03 cu. ft.) |
| Fuel tank capacity | 83 l (21.93 US gal | 18.26 UK gal) |
| Length | 4935 mm (194.29 in.) |
| Width | 2004 mm (78.9 in.) |
| Height | 1696 mm (66.77 in.) |
| Wheelbase | 2975 mm (117.13 in.) |
| Number of gears and type of gearbox | 8 gears, automatic transmission Steptronic |
Powertrain & Engine Architecture
At the heart of the X6 40i lies the BMW B58B30C 3.0-liter inline-six engine. This engine is a cornerstone of BMW’s modern powertrain strategy, known for its smooth power delivery and efficiency. The B58 utilizes direct fuel injection, a twin-scroll turbocharger, and BMW’s VALVETRONIC variable valve timing and lift system, along with Double-VANOS variable camshaft timing. These technologies work in concert to optimize combustion, reduce emissions, and enhance responsiveness. The mild hybrid system, a 48V setup, adds a small electric motor that provides a power boost during acceleration and allows for extended coasting with the engine off, improving fuel economy. The eight-speed Steptronic automatic transmission is a sophisticated unit, offering smooth and quick shifts. It features adaptive shift programs that adjust to the driver’s style and driving conditions.
Driving Characteristics
The X6 40i delivers a refined and capable driving experience. The 333 horsepower and 450 Nm (331.9 lb-ft) of torque provide ample power for confident acceleration and effortless highway cruising. The 0-60 mph sprint takes approximately 5.4 seconds. The Steptronic transmission is well-tuned, providing seamless gear changes and contributing to the overall smoothness. Compared to the X6 xDrive30i (the four-cylinder variant), the 40i offers a noticeable increase in power and responsiveness. While not as aggressively tuned as the X6 M50i, the 40i provides a satisfying balance between performance and comfort. The xDrive all-wheel-drive system ensures excellent traction and stability in various weather conditions.
Equipment & Trim Levels
The X6 40i came standard with a comprehensive suite of features, including BMW’s iDrive infotainment system with a 12.3-inch touchscreen display, navigation, Apple CarPlay and Android Auto compatibility, a premium sound system, leather upholstery, power-adjustable front seats with memory function, and a panoramic sunroof. Optional extras included upgraded leather options, ventilated and massaging front seats, a head-up display, a Bowers & Wilkins Diamond Surround Sound System, and various driver-assistance features like adaptive cruise control and lane-keeping assist. Trim levels were often bundled with specific packages, allowing buyers to customize their X6 to their preferences.
Chassis & Braking
The G06 X6 features a robust chassis with a double-wishbone front suspension and an independent multi-link rear suspension. This setup provides a comfortable ride while maintaining precise handling. The X6 40i typically came equipped with ventilated disc brakes on all four wheels, providing ample stopping power. The electronic stability control system (DSC) and Dynamic Traction Control (DTC) further enhance safety and stability. The steering is electrically assisted, offering a precise and responsive feel.
Market Reception & Comparison
The X6 40i was generally well-received by automotive critics. It was praised for its powerful engine, refined ride, and luxurious interior. Reviewers noted that the mild hybrid system contributed to improved fuel economy without sacrificing performance. Compared to the X6 xDrive30i, the 40i was considered a worthwhile upgrade for buyers seeking more power and a more engaging driving experience. However, some critics pointed out that the X6’s styling remained polarizing, and the optional extras could significantly increase the vehicle’s price. Fuel economy figures ranged from 8.8 to 10.3 l/100 km (26.7 – 22.8 US mpg) in combined driving, depending on driving style and conditions.
Legacy
The BMW X6 (G06) 40i represents a compelling blend of performance, luxury, and technology. The B58 engine has proven to be a reliable and durable powerplant, and the eight-speed Steptronic transmission is known for its smooth operation. While long-term reliability data is still accumulating, early indications suggest that the G06 X6 is a well-built and dependable vehicle. On the used car market, the 40i variant holds its value well, appealing to buyers who appreciate its balanced performance and luxurious features. The integration of mild hybrid technology also positions it as a more environmentally conscious choice within the SAC segment.
