The 2022 BMW M340i is a high-performance luxury sedan powered by a 3.0-liter BMW M TwinPower Turbo inline-six engine (B58) producing 382 horsepower and 369 lb-ft of torque. Featuring a 48V mild-hybrid system, an 8-speed ZF automatic transmission, and available xDrive all-wheel drive, it bridges the gap between the standard 3 Series and the track-focused M3.
The Engineering Philosophy of the M340i
The 2022 model year represents a refined iteration of the G20 generation BMW 3 Series. Positioned as an "M Performance" vehicle, the M340i serves a specific niche: drivers who demand the daily usability of a premium executive sedan but require the mechanical pedigree of BMW’s M division. In 2026, this specific model year is highly regarded in the pre-owned market for maintaining physical interior controls and the iDrive 7 system, just prior to the major "Life Cycle Impulse" (LCI) updates that shifted toward a fully curved digital interface.
The M340i is not merely a 330i with a larger engine; it features a reinforced chassis, M-specific suspension tuning, and an electronically controlled limited-slip rear differential as standard equipment. These components work in unison to provide a driving experience that is significantly more aggressive than the base 3 Series without the harshness often associated with a full-blown M3.
Powertrain: The Acclaimed B58 Engine
The centerpiece of the 2022 BMW M340i is the B58 3.0-liter turbocharged inline-six. Frequently cited as one of the best engines of the decade, the B58 is known for its smooth power delivery and significant tuning potential.
Performance Output and Delivery
For the 2022 model, the engine produces 382 horsepower between 5,800 and 6,500 rpm. Peak torque of 369 lb-ft is available early in the rev range, from 1,800 to 5,000 rpm. This wide torque plateau ensures that the vehicle feels responsive in almost any gear and at any legal road speed.
48V Mild-Hybrid Integration
A critical update for the 2021-2022 period was the integration of a 48V mild-hybrid system. This system includes a starter-generator that can provide an 11-horsepower boost under heavy acceleration. More importantly, it facilitates a smoother "Auto Start-Stop" function and allows the engine to shut off completely while coasting at speeds below 9 mph, improving efficiency without sacrificing the inline-six’s characteristic refinement.
Cooling and Lubrication
To handle the heat generated by the twin-scroll turbocharger, the M340i utilizes an indirect intercooler integrated into the intake manifold. This shortens the intake path, reducing turbo lag. The lubrication system is designed to maintain oil pressure even under high lateral G-forces, a nod to the vehicle's capability on winding roads or occasional track days.
Transmission and Drivetrain Dynamics
The 2022 BMW M340i utilizes the ZF 8-speed Steptronic Sport automatic transmission. While some enthusiasts may miss a manual option, the ZF 8HP is widely considered the industry benchmark for torque-converter automatics.
- Launch Control: Standard on all M340i models, allowing for optimized traction during standing starts.
- Gear Ratios: The first few gears are short to maximize acceleration, while the eighth gear acts as a tall overdrive to keep highway cruising RPMs low and fuel economy high.
- M Sport Differential: This electronically controlled rear differential is standard. It varies the lock between the rear wheels to improve corner-exit traction and prevent the inner wheel from spinning during aggressive maneuvers.
Rear-Wheel Drive (RWD) vs. xDrive All-Wheel Drive
Buyers in 2022 could choose between the traditional RWD layout and the xDrive intelligent all-wheel-drive system.
- RWD: Offers a lighter front end (saving approximately 150 lbs) and a more traditional "purist" steering feel.
- xDrive: Utilizes an electronically controlled multi-plate clutch to send up to 100% of power to the rear wheels under normal conditions, only diverting power to the front when slip is detected. The xDrive variant is significantly faster from a standstill, clocking a 0-60 mph time of 4.1 seconds, compared to 4.4 seconds for the RWD model.
Chassis, Suspension, and Braking
BMW engineers heavily modified the G20 chassis for the M Performance variant. The 2022 M340i sits 10mm lower than the 330i and features increased negative camber on the front wheels to improve turn-in response.
Suspension Options
There were two primary suspension setups available for the 2022 model:
- M Sport Suspension: A fixed-rate system that uses "lift-related" dampers. These dampers use extra hydraulic damping at the ends of their travel to prevent the car from bottoming out while remaining relatively compliant over smaller bumps.
- Adaptive M Suspension: An optional upgrade that uses electronically controlled valves to adjust damping forces at each wheel independently. This allows the driver to toggle between a "Comfort" mode for commuting and a "Sport Plus" mode for maximum body control.
Braking Performance
The vehicle comes standard with M Sport Brakes, identifiable by their blue (or optional red) calipers featuring the M logo. The front utilizes four-piston fixed calipers with 348mm vented discs, while the rear uses single-piston floating calipers with 345mm discs. This setup provides consistent stopping power and high resistance to brake fade during spirited driving.
2022 BMW M340i Technical Specifications Table
The following data represents the factory specifications for the North American 2022 BMW M340i.
| Specification | M340i (RWD) | M340i xDrive (AWD) |
|---|---|---|
| Engine Type | 3.0L Inline-6 TwinPower Turbo | 3.0L Inline-6 TwinPower Turbo |
| Horsepower | 382 hp @ 5,800–6,500 rpm | 382 hp @ 5,800–6,500 rpm |
| Torque | 369 lb-ft @ 1,800–5,000 rpm | 369 lb-ft @ 1,800–5,000 rpm |
| 0–60 mph | 4.4 Seconds | 4.1 Seconds |
| Top Speed | 130 mph / 155 mph (Limited) | 130 mph / 155 mph (Limited) |
| Transmission | 8-Speed ZF Automatic | 8-Speed ZF Automatic |
| Curb Weight | 3,849 lbs | 3,979 lbs |
| EPA Fuel Economy | 23 City / 32 Hwy / 26 Combined | 22 City / 30 Hwy / 25 Combined |
| Fuel Tank Capacity | 15.6 Gallons | 15.6 Gallons |
| Cargo Volume | 17.0 cu. ft. | 17.0 cu. ft. |
Interior, Technology, and Infotainment
The 2022 model year is often preferred by those who find modern all-touchscreen interfaces distracting. It features the iDrive 7.0 system, which balances a 10.25-inch touchscreen with the classic physical iDrive rotary controller and a dedicated bank of physical buttons for climate control and radio presets.
Cockpit and Seating
- Live Cockpit Professional: A 12.3-inch fully digital instrument cluster is standard on the M340i. It provides customizable views for navigation, media, and performance data.
- Seating: M Sport seats (standard in many regions) feature aggressive side bolsters to hold the driver in place. In the US, SensaTec synthetic leather was standard, while Vernasca leather was the premium option.
- Acoustics: Standard 10-speaker HiFi sound system, with a 16-speaker Harman Kardon Surround Sound system available as an option.
Connectivity
The 2022 M340i supports wireless Apple CarPlay and Android Auto as standard. It also includes the BMW Intelligent Personal Assistant, which allows for voice-activated control of various vehicle functions, such as changing the temperature or finding the nearest gas station.
Safety and Driver Assistance Systems
BMW equipped the 2022 M340i with a robust suite of safety technologies. While "Active Guard" (Forward Collision Warning and Automatic City Braking) is standard, many vehicles on the market feature the "Driving Assistance Professional Package."
- Active Blind Spot Detection: Notifies the driver of vehicles in the blind spot through steering wheel vibrations and a visual icon in the side mirrors.
- Lane Departure Warning: Alerts the driver if the car begins to drift out of its lane without a turn signal.
- Extended Traffic Jam Assistant: Only available with the Professional package, this allows for limited hands-free driving on divided highways at speeds below 40 mph.
- Parking Assistance Plus: Features a 360-degree Surround View camera system and Back-up Assistant, which can automatically retrace the vehicle's path for up to 50 yards to help navigate tight driveways.
Ownership and Maintenance Considerations in 2026
As of 2026, many 2022 M340i units are exiting their original four-year/50,000-mile factory warranty. For prospective buyers or current owners, understanding the maintenance requirements is vital for long-term reliability.
Reliability of the B58 Engine
The B58 engine has proven to be remarkably reliable compared to previous BMW turbocharged six-cylinder engines (like the N54 and N55). Common issues to monitor include:
- Coolant Loss: Some owners have reported minor coolant evaporation or leaks from the expansion tank cap; regular checks are recommended.
- Oil Filter Housing: While less common on the B58 than its predecessors, the plastic oil filter housing should be inspected for cracks or leaks during every oil change.
- Battery Health: The 48V mild-hybrid battery is designed to last the life of the vehicle, but its performance can be affected by extreme temperatures or prolonged periods of inactivity.
Maintenance Schedule
- Oil Changes: BMW recommends every 10,000 miles or 12 months, but many enthusiasts opt for 5,000 to 7,500-mile intervals to ensure the longevity of the turbocharger.
- Brake Fluid: Should be flushed every two years regardless of mileage to prevent moisture buildup in the hydraulic system.
- Spark Plugs: Due for replacement every 60,000 miles or six oil changes on the B58 engine.
Frequently Asked Questions
Does the 2022 BMW M340i have a manual transmission?
No, the 2022 BMW M340i was only produced with the 8-speed ZF automatic transmission. For a manual 3 Series from this era, one would have to step up to the standard BMW M3 (G80) or look at older generations like the F30.
What is the difference between the 2022 and 2023 M340i?
The 2022 model uses the iDrive 7 system with separate screens and physical climate controls. The 2023 model received the "LCI" update, which introduced the BMW Curved Display (iDrive 8), removed the physical buttons for the climate system, and replaced the traditional gear lever with a small toggle switch.
How much does it cost to maintain a 2022 M340i?
Annual maintenance costs typically range from $800 to $1,500 depending on mileage. This includes routine oil changes, filters, and inspections. Wear items like the M Sport brake pads and high-performance tires (often Michelin Pilot Sport 4S) are more expensive to replace than those on a standard 330i.
Is the 2022 M340i a "Real" M car?
Technically, it is an "M Performance" vehicle, not a "Full M" car. While it uses many M-developed components and is tuned by the M division, it lacks the bespoke S58 engine, widened bodywork, and track-optimized cooling systems of the M3. However, many reviewers consider it a better daily driver due to its more comfortable ride and quieter cabin.
What is the real-world fuel economy of the B58?
While the EPA rates the xDrive model at 25 mpg combined, the B58 is famously efficient on the highway. Many owners report achieving 32–35 mpg during steady-state cruising at 70 mph, making it one of the most efficient six-cylinder performance cars in its class.
Final Recommendations
If you are researching the 2022 BMW M340i specs for a potential purchase, focus your search on vehicles equipped with the Adaptive M Suspension and the Driving Assistance Professional Package. These two options significantly enhance the car's versatility, allowing it to transition from a comfortable long-distance cruiser to a sharp sport sedan at the push of a button.
Furthermore, ensure any pre-owned vehicle has a documented service history that adheres to the condition-based service (CBS) intervals. The 2022 M340i remains a benchmark in the segment, offering a level of mechanical "soul" and tactile ergonomics that some feel has been diluted in more recent, screen-heavy iterations of the 3 Series.
