The BMW 3 Series Sedan (F30 LCI), specifically the 340i xDrive Steptronic variant, represents a significant evolution in the lineage of BMW’s iconic sports sedan. Produced from 2015 to 2018, this facelifted version of the F30 generation brought updated styling, enhanced technology, and a potent new engine to the market. The 340i xDrive Steptronic occupied the upper-mid-range position within the F30 lineup, offering a compelling blend of performance, luxury, and all-weather capability. It served as a direct successor to the 335i, aiming to provide a more refined and efficient driving experience while maintaining the core BMW driving dynamics.
Technical Specifications
| Brand | BMW |
| Model | 3 Series |
| Generation | 3 Series Sedan (F30 LCI, Facelift 2015) |
| Type | 340i (326 Hp) xDrive Steptronic |
| Start of production | 2015 |
| End of production | 2018 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Sedan |
| Seats | 5 |
| Doors | 4 |
| Fuel consumption (urban) | 9.7-9.2 l/100 km (24.2 – 25.6 US mpg) |
| Fuel consumption (extra urban) | 5.9-5.6 l/100 km (39.9 – 42 US mpg) |
| Fuel consumption (combined) | 7.3-6.9 l/100 km (32.2 – 34.1 US mpg) |
| CO2 emissions | 169-162 g/km |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 100 km/h | 4.9 sec |
| Acceleration 0 – 62 mph | 4.9 sec |
| Acceleration 0 – 60 mph | 4.7 sec |
| Maximum speed | 250 km/h (155.34 mph) |
| Emission standard | Euro 6 |
| Weight-to-power ratio | 5 kg/Hp, 201.9 Hp/tonne |
| Weight-to-torque ratio | 3.6 kg/Nm, 278.6 Nm/tonne |
| Power | 326 Hp @ 5500-6500 rpm |
| Torque | 450 Nm @ 1380-5000 rpm (331.9 lb.-ft. @ 1380-5000 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 | 7.8 l (8.24 US qt | 6.86 UK qt) |
| Kerb Weight | 1615 kg (3560.47 lbs.) |
| Max. weight | 2165 kg (4773.01 lbs.) |
| Max load | 550 kg (1212.54 lbs.) |
| Trunk (boot) space – minimum | 480 l (16.95 cu. ft.) |
| Fuel tank capacity | 60 l (15.85 US gal | 13.2 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 | 4633 mm (182.4 in.) |
| Width | 1811 mm (71.3 in.) |
| Height | 1434 mm (56.46 in.) |
| Wheelbase | 2810 mm (110.63 in.) |
| Front track | 1531 mm (60.28 in.) |
| Rear (Back) track | 1570 mm (61.81 in.) |
| Ride height (ground clearance) | 145 mm (5.71 in.) |
| Drag coefficient (Cd) | 0.30 |
| Minimum turning circle (turning diameter) | 11.7 m (38.39 ft.) |
| Drive wheel | All wheel drive (4×4) |
| Number of gears and type of gearbox | 8 gears, automatic transmission Steptronic |
| Front suspension | Independent coil spring |
| 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 | 225/50 R17 94W |
| Wheel rims size | 7.5J x 17 |
Powertrain & Engine Architecture
The heart of the 340i xDrive Steptronic is BMW’s B58B30A 3.0-liter inline-six engine. This engine represents a departure from the previous N55, utilizing a single twin-scroll turbocharger instead of a twin-turbo setup. This simplification, coupled with advancements in direct injection and valvetronic technology, resulted in improved efficiency and a broader torque curve. The B58 boasts a robust cast aluminum block and head, contributing to its durability. Fuel is delivered via high-pressure direct injection, and the engine features variable valve timing (Valvetronic) and variable valve lift (Double-VANOS) for optimized performance across the rev range. The engine is paired with BMW’s eight-speed Steptronic automatic transmission, known for its smooth shifts and quick response. The ‘xDrive’ designation indicates BMW’s intelligent all-wheel-drive system, which dynamically distributes torque between the front and rear axles for enhanced traction and stability.
Driving Characteristics
The 340i xDrive Steptronic delivers a refined yet engaging driving experience. The 326 horsepower and 331 lb-ft of torque provide ample power for both everyday commuting and spirited driving. The eight-speed automatic transmission is well-tuned, offering seamless gear changes and contributing to the car’s impressive acceleration – 0 to 60 mph in approximately 4.7 seconds. Compared to the six-speed manual transmission available on some 340i models, the Steptronic offers quicker acceleration due to its faster shift times. While not as raw or visceral as a manual, the Steptronic provides a comfortable and convenient driving experience, particularly in traffic. The xDrive all-wheel-drive system enhances grip and stability, especially in inclement weather, making the 340i a capable year-round vehicle.
Equipment & Trim Levels
The 340i xDrive Steptronic typically came well-equipped as standard. Features included leather upholstery, power-adjustable front seats with memory function, a premium sound system, automatic climate control, and BMW’s iDrive infotainment system with a central display screen. Optional extras were plentiful, including a head-up display, navigation system, adaptive cruise control, lane departure warning, and a sunroof. Interior trim options ranged from wood veneers to aluminum accents, allowing buyers to personalize the cabin to their preferences. The standard exterior styling included BMW’s signature kidney grille, LED headlights, and alloy wheels. Sport packages were available, adding more aggressive styling cues and performance-enhancing features.
Chassis & Braking
The F30 3 Series utilizes a sophisticated chassis design featuring an independent suspension at all four corners. The front suspension employs coil springs and struts, while the rear utilizes a multi-link setup. This configuration provides a good balance between ride comfort and handling precision. The 340i xDrive Steptronic typically came equipped with ventilated disc brakes on all four wheels, providing ample stopping power. Anti-lock braking system (ABS) and electronic stability control (ESC) were standard safety features. The steering system is a rack-and-pinion setup with electric power assistance, offering precise and responsive steering feel.
Market Reception & Comparison
The 340i xDrive Steptronic was generally well-received by automotive critics. It was praised for its powerful engine, refined driving dynamics, and comfortable interior. Compared to the previous 335i, the 340i offered improved fuel economy and a more linear power delivery. Against competitors like the Audi A4 and Mercedes-Benz C-Class, the 340i was often lauded for its superior handling and more engaging driving experience. Fuel economy figures averaged around 32-34 mpg combined, making it a relatively efficient option for a performance sedan. Reliability was generally good, although some owners reported minor issues with the cooling system and electronic components.
Legacy
The B58 engine found in the 340i xDrive Steptronic has proven to be a remarkably durable and reliable powerplant. It has since been used in a wide range of BMW models and continues to be highly regarded by enthusiasts. On the used car market, the F30 340i xDrive Steptronic holds its value well, due to its combination of performance, luxury, and reliability. Properly maintained examples are sought after by buyers looking for a capable and enjoyable sports sedan. The 340i represents a sweet spot in the F30 generation, offering a significant performance upgrade over the base models without the added complexity and cost of the M3.
