Technical Specifications
| Brand | BMW |
| Model | 3 Series |
| Generation | 3 Series Touring (G21 LCI, facelift 2022) |
| Type (Engine) | M340d (340 Hp) Mild Hybrid xDrive Steptronic |
| Start of production | July, 2022 |
| Powertrain Architecture | MHEV (Mild Hybrid Electric Vehicle) |
| Body type | Station wagon (estate) |
| Seats | 5 |
| Doors | 5 |
| Combined fuel consumption (WLTP) | 6-6.6 l/100 km (39.2 – 35.6 US mpg, 47.1 – 42.8 UK mpg, 16.7 – 15.2 km/l) |
| CO2 emissions (WLTP) | 157-173 g/km |
| Fuel Type | Diesel |
| Acceleration 0 – 100 km/h | 4.7 sec |
| Acceleration 0 – 62 mph | 4.7 sec |
| Acceleration 0 – 60 mph | 4.5 sec |
| Maximum speed | 250 km/h (155.34 mph) |
| Emission standard | Euro 6d |
| Weight-to-power ratio | 5.5 kg/Hp, 181.8 Hp/tonne |
| Weight-to-torque ratio | 2.7 kg/Nm, 374.3 Nm/tonne |
| Gross battery capacity | 0.4 kWh |
| Battery voltage | 48 V |
| Battery technology | Lithium-ion (Li-Ion) |
| Battery location | Under the front hood |
| Electric motor power | 11 Hp |
| Electric motor Torque | 25 Nm (18.44 lb.-ft.) |
| Electric motor location | Front, Longitudinal |
| Power | 340 Hp @ 4400 rpm |
| Torque | 700 Nm @ 1750-2250 rpm (516.29 lb.-ft. @ 1750-2250 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | B57D30B |
| Engine displacement | 2998 cm3 (182.95 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 |
| Valvetrain | DOHC |
| Engine oil capacity | 7 l (7.4 US qt | 6.16 UK qt) |
| Kerb Weight | 1870 kg (4122.64 lbs.) |
| Max. weight | 2430 kg (5357.23 lbs.) |
| Max load | 560 kg (1234.59 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 | 12.98 UK gal) |
| Max. roof load | 75 kg (165.35 lbs.) |
| Permitted trailer load with brakes (12%) | 1800 kg (3968.32 lbs.) |
| Permitted trailer load without brakes | 750 kg (1653.47 lbs.) |
| Permitted towbar download | 75 kg (165.35 lbs.) |
| Length | 4713 mm (185.55 in.) |
| Width | 1827 mm (71.93 in.) |
| Width including mirrors | 2068 mm (81.42 in.) |
| Height | 1446 mm (56.93 in.) |
| Wheelbase | 2851 mm (112.24 in.) |
| Front track | 1583 mm (62.32 in.) |
| Rear (Back) track | 1567 mm (61.69 in.) |
| Front overhang | 803 mm (31.61 in.) |
| Rear overhang | 1059 mm (41.69 in.) |
| Ride height (ground clearance) | 135 mm (5.31 in.) |
| Drag coefficient (Cd) | 0.29 |
| Minimum turning circle (turning diameter) | 12 m (39.37 ft.) |
| Drivetrain Architecture | ICE and electric motor drive all four wheels, mixed mode operation. |
| Drive wheel | All wheel drive (4×4) |
| Number of gears and type of gearbox | 8 gears, automatic transmission Steptronic |
| Front suspension | Spring Strut, Transverse stabilizer |
| Rear suspension | Independent multi-link spring suspension with stabilizer |
| 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 | Front: 225/45 R18, Rear: 255/40 R18 |
| Wheel rims size | Front: 7.5J x 18, Rear: 8.5J x 18 |
The BMW 3 Series Touring (G21 LCI) M340d xDrive Steptronic, introduced in July 2022, represents a significant refinement within the premium compact executive estate segment. This model is part of the Life Cycle Impulse (LCI) facelift for the G21 generation, blending robust diesel performance with mild-hybrid technology and BMW’s xDrive all-wheel-drive system. Positioned as a high-performance offering in the 3 Series Touring lineup, it appeals to buyers desiring a combination of practicality, dynamic driving, and efficiency. The G21 LCI builds upon the G21 platform, which debuted in 2019, featuring updated styling, enhanced technology, and refined powertrain options.
Powertrain & Engine Architecture
At the core of the M340d xDrive Steptronic is BMW’s B57D30B 3.0-liter inline-six diesel engine. This engine received substantial updates for the LCI model, incorporating the latest generation of common-rail direct injection and a sophisticated two-stage turbocharging system. The turbochargers, coupled with an intercooler, deliver substantial torque across a wide rev range. The mild-hybrid system, operating on a 48V electrical architecture, adds an electric motor contributing 11 horsepower and 25 Nm (18.44 lb-ft) of torque. This system enables features like smoother start-stop operation and extended coasting, enhancing fuel efficiency. The engine is paired with BMW’s eight-speed Steptronic automatic transmission, renowned for its quick and precise shifts. The transmission is specifically calibrated to complement the engine’s characteristics, offering both responsive acceleration and relaxed cruising.
Driving Characteristics
The M340d xDrive Steptronic delivers a compelling driving experience. The combination of the powerful diesel engine and the all-wheel-drive system results in brisk acceleration – approximately 4.5 seconds from 0 to 60 mph. The mild-hybrid system enhances responsiveness, particularly during initial acceleration. While not as overtly sporty as the gasoline-powered M340i, the M340d offers ample power for overtaking and confident highway cruising. The Steptronic transmission provides seamless gear changes, and the xDrive system ensures excellent traction in various weather conditions. The gear ratios are optimized for both performance and fuel economy, with taller gears for efficient highway driving and shorter gears for quick acceleration.
Equipment & Trim Levels
The M340d xDrive Steptronic typically comes well-equipped as standard. Interior features include sport seats upholstered in premium materials, a leather-wrapped steering wheel, and a modern dashboard layout with BMW’s iDrive infotainment system. Standard safety features include automatic emergency braking, lane departure warning, and adaptive cruise control. Optional extras include a head-up display, premium sound system, panoramic sunroof, and various driver-assistance packages. The M Sport package is a popular option, adding more aggressive styling cues, sport suspension, and upgraded brakes.
Chassis & Braking
The G21 LCI M340d utilizes a sophisticated chassis design. The front suspension features a spring strut setup with a transverse stabilizer, while the rear employs an independent multi-link spring suspension, also with a stabilizer bar. This configuration provides a good balance between ride comfort and handling precision. The braking system consists of ventilated discs on all four wheels, providing ample stopping power. The xDrive all-wheel-drive system intelligently distributes torque between the front and rear axles, optimizing traction and stability.
Market Reception & Comparison
The M340d xDrive Steptronic has been generally well-received by automotive critics. It’s praised for its strong performance, refined ride quality, and impressive fuel economy. Compared to the 330d variant, the M340d offers a significant power upgrade and a more engaging driving experience. While the gasoline-powered M340i provides a more exhilarating soundtrack and slightly sharper handling, the M340d offers superior fuel efficiency and a broader torque curve. Reliability has been generally good, although, as with any modern diesel, proper maintenance is crucial, particularly regarding the diesel particulate filter (DPF).
Legacy
The BMW 3 Series Touring (G21 LCI) M340d xDrive Steptronic represents a compelling option for buyers seeking a practical, high-performance estate car. The B57 engine has proven to be a robust and reliable unit, and the mild-hybrid technology adds a layer of efficiency and refinement. On the used car market, these models are holding their value well, reflecting their desirable combination of performance, practicality, and build quality. With proper maintenance, the M340d powertrain is expected to provide years of reliable service, making it a strong contender in the premium compact executive estate segment.
