The BMW 3 Series Touring (G21 LCI), specifically the M340i xDrive Steptronic model, represents a performance-oriented variant of the sixth-generation 3 Series Touring (estate) produced from July 2022 to September 2025. This facelift, designated LCI (Life Cycle Impulse) by BMW, brought updated styling, technology, and powertrain refinements to the popular 3 Series lineup. The M340i trim sits at the top of the non-M performance range, offering a blend of practicality, luxury, and engaging driving dynamics. It’s positioned as a step up from the 330i models, providing significantly more power and performance features while remaining more accessible than the dedicated M3 Touring.
Technical Specifications
| Brand | BMW |
| Model | 3 Series |
| Generation | 3 Series Touring (G21 LCI, facelift 2022) |
| Type (Engine) | M340i (374 Hp) Mild Hybrid xDrive Steptronic |
| Start of production | July, 2022 |
| End of production | September, 2025 |
| Powertrain Architecture | MHEV (Mild Hybrid Electric Vehicle) |
| Body type | Station wagon (estate) |
| Seats | 5 |
| Doors | 5 |
| Combined fuel consumption (WLTP) | 8.1-8.8 l/100 km (29 – 26.7 US mpg) |
| CO2 emissions (WLTP) | 182-197 g/km |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 100 km/h | 4.6 sec |
| Acceleration 0 – 62 mph | 4.6 sec |
| Acceleration 0 – 60 mph | 4.4 sec |
| Maximum speed | 250 km/h (155.34 mph) |
| Emission standard | Euro 6d |
| Weight-to-power ratio | 4.8 kg/Hp |
| Weight-to-torque ratio | 3.6 kg/Nm |
| Gross battery capacity | 0.4 kWh |
| Battery voltage | 48 V |
| Battery technology | Lithium-ion (Li-Ion) |
| Electric motor power | 11 Hp |
| Electric motor Torque | 25 Nm (18.44 lb.-ft.) |
| Power | 374 Hp @ 5500-6500 rpm |
| Torque | 500 Nm @ 1900-5000 rpm (368.78 lb.-ft. @ 1900-5000 rpm) |
| Engine displacement | 2998 cm3 (182.95 cu. in.) |
| Number of cylinders | 6 |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | B58B30B |
| Cylinder Bore | 82 mm (3.23 in.) |
| Piston Stroke | 94.6 mm (3.72 in.) |
| Compression ratio | 10.2:1 |
| Engine oil capacity | 7.2 l (7.61 US qt | 6.34 UK qt) |
| Kerb Weight | 1795 kg (3957.3 lbs.) |
| Max. weight | 2390 kg (5269.05 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 | 12.98 UK 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.) |
| Front track | 1583 mm (62.32 in.) |
| Rear track | 1567 mm (61.69 in.) |
| Gearbox | 8 gears, automatic transmission Steptronic |
Powertrain & Engine Architecture
At the heart of the M340i Touring lies BMW’s B58B30B 3.0-liter inline-six engine. This engine is a cornerstone of BMW’s modern powertrain strategy, known for its smooth power delivery and responsiveness. The B58 utilizes direct fuel injection, a twin-scroll turbocharger, and an intercooler to achieve a potent 374 horsepower and 368 lb-ft of torque. The engine also incorporates BMW’s VALVETRONIC variable valve timing and Double-VANOS variable camshaft timing systems, optimizing efficiency and performance across the rev range. Crucially, the M340i features a 48V mild-hybrid system. This system employs a 11 hp electric motor integrated into the drivetrain, providing a power boost during acceleration and enabling smoother start-stop operation. The eight-speed Steptronic automatic transmission is standard, offering quick and precise shifts. This transmission is programmed for both comfort and performance, adapting to the driver’s style.
Driving Characteristics
The M340i Touring delivers a compelling driving experience. The combination of the potent inline-six, the mild-hybrid assist, and the eight-speed automatic results in a 0-60 mph time of around 4.4 seconds. The xDrive all-wheel-drive system provides excellent traction, particularly in adverse weather conditions. Compared to the 330i models, the M340i offers a noticeably more urgent response and greater overall performance. While not as raw or focused as the M3, the M340i provides a satisfying balance between performance and everyday usability. The automatic transmission is well-tuned, offering both seamless shifts in comfort mode and aggressive downshifts in sport mode. The steering is precise and well-weighted, contributing to a confident and engaging driving experience.
Equipment & Trim Levels
The M340i Touring comes generously equipped as standard. Key features include BMW’s Live Cockpit Professional (digital instrument cluster and infotainment system), leather upholstery, power-adjustable front seats with memory function, and a premium sound system. Exterior styling cues differentiate the M340i from other 3 Series Touring models, including a more aggressive front fascia, M-specific side mirrors, and a rear diffuser. Optional extras include adaptive suspension, a head-up display, ventilated front seats, and a panoramic sunroof. Interior trim options allow for personalization, with choices ranging from aluminum to wood accents.
Chassis & Braking
The M340i Touring benefits from a chassis tuned for performance. It features a spring strut front suspension with a transverse stabilizer and an independent multi-link rear suspension, also with a stabilizer bar. The suspension is firmer than that of the standard 3 Series models, providing improved handling and reduced body roll. Braking duties are handled by ventilated discs at all four corners, providing ample stopping power. The M340i also includes ABS (Anti-lock braking system) and electronic stability control as standard safety features.
Market Reception & Comparison
The M340i Touring was generally well-received by automotive critics. It was praised for its powerful engine, engaging driving dynamics, and practical estate car body style. Compared to the 330i Touring, the M340i offered a significant performance upgrade, justifying the higher price tag for enthusiasts. Fuel economy, while not exceptional, was considered reasonable for a performance vehicle of this type, ranging from 26.7 to 29 US mpg combined. Reliability reports have been generally positive, with the B58 engine proving to be a robust and dependable unit.
Legacy
The B58 engine, found in the M340i Touring, has established a reputation for long-term reliability and durability. On the used car market, the M340i Touring holds its value well, appealing to buyers seeking a blend of performance, practicality, and luxury. The mild-hybrid system, while not a full hybrid, represents a step towards electrification and contributes to improved fuel efficiency and reduced emissions. The G21 LCI M340i Touring remains a desirable and well-regarded performance estate car, offering a compelling alternative to traditional sports sedans.
