BMW M340i

Core summary

The G20/G21 M340i brings six-cylinder performance to the practical 3 Series format. Sedan and Touring availability, driven wheels and output depend on the market and production year.

The M340i sits between the everyday four-cylinder 3 Series proposition and the more specialised M3. That position is its point: a buyer can want a stronger drivetrain without making every other part of the purchase about maximum performance. The reference here is the G20/G21 generation, with the 2019 UK introduction used for the quoted output.

History & generations

BMW’s UK introduction covered both the Saloon and Touring, with the Touring arriving in November 2019. Later updates changed the cabin and other details, so the model name is not a complete specification. A used-car comparison should separate body style and production period before treating two M340i listings as equivalent.

Body, platform & design

The G20 sedan has a separate boot; the G21 Touring is the estate alternative. For dog transport, bulky sports equipment or frequent furniture-sized loads, the loading opening can matter more than acceleration. Do not pay for the sedan’s appearance and then discover that the household’s largest regular item only fits comfortably in the estate.

Engine & drivetrain

The cited UK launch M340i xDrive uses a 3.0-litre turbocharged straight-six rated at 374 hp in BMW’s UK release and 500 Nm, paired with an eight-speed automatic and all-wheel drive. These figures describe that edition. They should not be copied into an advertisement for every later or non-UK M340i, whose equipment and ratings may differ.

Trim differences

M340i is a powertrain and chassis derivative, not merely a 320i wearing an M Sport styling package. Conversely, it is not an M3. When comparing prices, establish that the seller is describing an actual M340i, then compare suspension options, seats and body style. The distinction is more useful than counting M badges inside the cabin.

Interior & seating

Use the rear seat and luggage compartment before deciding that the car can replace a larger family vehicle. The Touring’s cargo access changes the proposition, but neither body should be bought on photographs alone. Set the driver’s seat first, then check the space left behind it for the passenger or child seat that will actually travel there.

Efficiency & range

The sensible cost comparison is a similarly used 330i, not an M3 driven under different conditions. The straight-six is a deliberate performance choice, and the fuel budget should acknowledge that. Record consumption over a representative route if a long demonstration is available; a reset trip computer at the end of a gentle dealership loop is not an ownership estimate.

Safety & equipment

Check which assistance functions the individual example has rather than assuming the M340i badge includes all of them. For a used performance derivative, tyre condition and evidence of alterations deserve attention alongside the options list. This is a purchase check, not a claim that M340i owners generally modify or misuse their cars.

Strengths

Its appeal is the combination rather than one isolated number: a six-cylinder drivetrain in a body that can handle ordinary errands and passenger duties. The Touring makes that argument especially tangible for an owner who needs a large loading opening. Buyers who do not value the drivetrain may find the less powerful 3 Series a better allocation of money.

Considerations

Distinguish standard specification from tuning claims. Ask whether engine software, exhaust, suspension or wheel changes have been made and whether the original configuration can be documented. A modified example is a different risk assessment from a standard one; the seller’s claimed power figure should not replace a condition inspection.

Recommended use

It belongs on the list for an enthusiast who needs one car for work, family travel and leisure. Decide first whether the estate body solves a recurring task. If it does, the Touring may be the more convincing purchase even if the sedan looks better in the advertisement.

Rivals & related

An Audi S4 and Mercedes-AMG C43 are reasonable performance-sedan references, but engines and body availability vary across generations and countries. A BMW 330i is the internal alternative for a buyer testing how much the six-cylinder matters. An M3 answers a more performance-focused question and should not automatically be the next step.

FAQ

Q: Is an M Sport 3 Series an M340i?
A: No. An appearance or equipment line does not establish the engine derivative.

Q: Does this profile cover the Touring?
A: Yes, as the G21 body alternative; availability depends on country.

Q: Can the launch output be used for a newer car?
A: Only after matching its year and market to an official specification.

Sources & updates

Specification reference: BMW: M340i xDrive Saloon and Touring, 2019 UK introduction. The linked manufacturer material identifies the edition used here; specifications are not universal across years or countries.

The buying comparisons and suitability judgements are Cariary editorial analysis, not claims from a road test. Existing photograph credits identify the photographed generation and any unverified trim; an illustrative photograph is not proof of equipment.

• Official model information →
• Manufacturer media archive →
• Photograph — BMW M340i xDrive G20, front three-quarter view in Brunei →AIMHO'S REBELLION 8490s; CC BY-SA 4.0

Last editorial review: September 20, 2026 — vehicle-specific editorial revision. Specifications remain market- and model-year-specific.