The BMW 3 Series Touring (G21 LCI), specifically the M340i xDrive Steptronic variant, represents the performance-oriented offering within the facelifted sixth generation of BMW’s popular compact executive estate car. Introduced with the LCI (Life Cycle Impulse) update in 2022 for the 2025 model year, this version combines a potent inline-six engine with mild hybrid technology and BMW’s xDrive all-wheel-drive system. It builds upon the foundation of the G21 platform, which debuted in 2019, offering a blend of practicality, driving dynamics, and modern technology. The M340i sits at the top of the 3 Series Touring range, positioned as a premium alternative to more mainstream estate cars.
Technical Specifications
| Brand | BMW |
| Model | 3 Series |
| Generation | 3 Series Touring (G21 LCI, facelift 2022) |
| Type (Engine) | M340i (392 Hp) Mild Hybrid xDrive Steptronic |
| Start of production | September, 2025 |
| Powertrain Architecture | MHEV (Mild Hybrid Electric Vehicle) |
| Body type | Station wagon (estate) |
| Seats | 5 |
| Doors | 5 |
| Combined fuel consumption (WLTP) | 7.3-7.9 l/100 km (32.2 – 29.8 US mpg) |
| CO2 emissions (WLTP) | 165-181 g/km |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 100 km/h | 4.5 sec |
| Acceleration 0 – 62 mph | 4.5 sec |
| Acceleration 0 – 60 mph | 4.3 sec |
| Maximum speed | 250 km/h (155.34 mph) |
| Emission standard | Euro 6e |
| Weight-to-power ratio | 4.7 kg/Hp |
| Weight-to-torque ratio | 3.4 kg/Nm |
| Gross battery capacity | 0.4 kWh |
| Battery voltage | 48 V |
| Battery technology | Lithium-ion (Li-Ion) |
| Electric motor power | 12 Hp |
| Electric motor Torque | 200 Nm (147.51 lb.-ft.) |
| System power | 392 Hp |
| Power | 381 Hp @ 5200-6250 rpm |
| Torque | 540 Nm @ 1900-4800 rpm (398.28 lb.-ft. @ 1900-4800 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | B58 |
| 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.) |
| Fuel injection system | Direct injection |
| Engine aspiration | Twin-scroll turbo, Intercooler |
| Valvetrain | VALVETRONIC, Double-VANOS |
| Kerb Weight | 1830 kg (4034.46 lbs.) |
| Max. weight | 2425 kg (5346.21 lbs.) |
| Max load | 595 kg (1311.75 lbs.) |
| Trunk (boot) space – minimum | 500 l (17.66 cu. ft.) |
| Trunk (boot) space – maximum | 1510 l (53.33 cu. ft.) |
| Fuel tank capacity | 59 l (15.59 US gal) |
| Length | 4714 mm (185.59 in.) |
| Width | 1827 mm (71.93 in.) |
| Height | 1440 mm (56.69 in.) |
| Wheelbase | 2851 mm (112.24 in.) |
| Number of gears | 8 |
| Gearbox type | automatic transmission Steptronic |
Powertrain & Engine Architecture
The heart of the M340i Touring is BMW’s B58 3.0-liter inline-six engine. This engine is renowned for its smooth power delivery and responsiveness. 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 efficiency and performance across the engine’s operating range. The mild hybrid system, incorporating a 48V lithium-ion battery and a 12 hp electric motor, provides a power boost during acceleration and enables smoother start-stop operation. The engine produces 381 horsepower at 5,200-6,250 rpm and 540 Nm (398.28 lb-ft) of torque between 1,900 and 4,800 rpm. This power is channeled through an eight-speed Steptronic automatic transmission, which is known for its quick and precise shifts. The xDrive all-wheel-drive system intelligently distributes torque between the front and rear axles, enhancing traction and stability in various driving conditions.
Driving Characteristics
The M340i Touring delivers a compelling driving experience. The combination of the potent engine, responsive transmission, and xDrive all-wheel drive results in brisk acceleration – 0 to 60 mph in approximately 4.3 seconds. The mild hybrid system contributes to a seamless power delivery, minimizing turbo lag and providing an extra surge of acceleration when needed. The Steptronic transmission offers both automatic and manual shift modes, allowing drivers to tailor the driving experience to their preferences. Compared to lower-powered 3 Series Touring variants, such as the 320i or 330i, the M340i offers significantly more performance and a more engaging driving experience. While the 330i provides a good balance of efficiency and performance, the M340i prioritizes outright speed and driving dynamics. The gear ratios are tuned for both acceleration and comfortable highway cruising.
Equipment & Trim Levels
The M340i Touring comes standard with a comprehensive array of features, reflecting its premium positioning. Standard equipment typically includes BMW’s Live Cockpit Professional, featuring a 12.3-inch digital instrument cluster and a 14.9-inch central information display. Leather upholstery, sport seats, and M-specific styling cues are also standard. Optional extras include a panoramic sunroof, premium sound system, adaptive suspension, and a head-up display. The interior is well-appointed and features high-quality materials throughout. The LCI update brought subtle revisions to the interior design, including updated graphics for the infotainment system and new trim options.
Chassis & Braking
The M340i Touring features a chassis tuned for performance and handling. The suspension consists of a spring strut setup at the front and an independent multi-link spring suspension at the rear, both incorporating a transverse stabilizer bar. The suspension is firmer than that of lower-powered 3 Series Touring models, providing improved body control and reduced roll. Braking duties are handled by ventilated discs on all four wheels, providing ample stopping power. The M340i also benefits from BMW’s Dynamic Stability Control (DSC) system, which helps to maintain stability in challenging driving conditions.
Market Reception & Comparison
The M340i Touring has been well-received by automotive critics, who praise its performance, handling, and practicality. It is often lauded as one of the most engaging and enjoyable estate cars on the market. Compared to other performance estate cars, such as the Audi S4 Avant or the Mercedes-AMG C43 Estate, the M340i offers a compelling combination of performance, refinement, and technology. Fuel economy is respectable for a performance car, with combined WLTP figures ranging from 7.3 to 7.9 l/100 km. Reliability has generally been good, although some owners have reported minor issues with the infotainment system.
Legacy
The B58 engine has proven to be a robust and reliable powerplant, and the M340i Touring is expected to hold its value well in the used car market. The combination of performance, practicality, and BMW’s reputation for build quality makes it a desirable option for enthusiasts and families alike. As with any modern performance car, regular maintenance is crucial to ensure long-term reliability. The mild hybrid system adds a layer of complexity, but it is generally considered to be reliable. The G21 LCI M340i Touring represents a refined and capable estate car that continues BMW’s tradition of building engaging and rewarding driving machines.
