Car Model History

Four-door sedan · 3.0L B58 turbocharged inline-six with 48-volt mild-hybrid system (382 hp / 369 lb-ft)

2021 BMW M340i Sedan

BMW's U.S. 2021 model information lists the M340i as a distinct G20 3 Series sedan configuration.

2021 BMW M340i xDrive G20 sedan, front three-quarter view
Exact 2021 3 Series reference photograph; exact configuration not verified ·

Photo: “2021 BMW 3-Series M340i xDrive.jpg” by Chanokchon / Wikimedia Commons, licensed under CC BY-SA 4.0. Cropped to 16:9.

Factory configuration

What this model is

Trim
M340i
Body style
Four-door sedan
Engine
3.0L B58 turbocharged inline-six with 48-volt mild-hybrid system (382 hp / 369 lb-ft)
Transmission
8-speed Steptronic automatic

BMW added a 48-volt mild-hybrid system to both M340i drivetrains for model year 2021. Confirm the VIN and electrical system before ordering starter/generator or charging-system components.

Configuration-specific ownership

Maintenance for this exact configuration

These items are filtered to the engine, transmission, trim, and model-year applicability recorded for this configuration. Broad Amazon category searches are suppressed here; shopping links appear only beside catalog-backed part numbers.

Service desk

What this car needs & when

Use this as a service-planning checklist for 2021 BMW M340i Sedan. Start with the interval, confirm which engine or configuration you have, then use an exact ordering reference when one is verified.

Service topics
4
Factory intervals
0
Fitment-scoped
4
Exact references
1

Before orderingIdentify your engine, options and build date.Part numbers and sizes can change within one model year. Shopping links appear only for catalog-backed references; still verify the listing against your vehicle before ordering.

  • Brake fluid

    Fitment must be confirmed

    BMW publishes this as a Condition Based Service task: follow the vehicle's displayed date/mileage forecast rather than a fixed generic interval.

    Applies to: 2021 · United States

    Source: BMW USA service-and-warranty library — select 2021 Maintenance booklet · Maintenance System — brake fluid · checked

  • Cabin microfilter

    Fitment must be confirmed

    BMW combines this task with the engine-oil service occurrence identified by the vehicle.

    Applies to: 2021 · United States

    Source: BMW USA service-and-warranty library — select 2021 Maintenance booklet · Maintenance Intervals — "combine with Engine oil" tasks · checked

  • Engine air filter

    Exact reference available

    BMW combines this task with the engine-oil service occurrence identified by the vehicle.

    Applies to: 2021 · United States

    Source: BMW USA service-and-warranty library — select 2021 Maintenance booklet · Maintenance Intervals — "combine with Engine oil" tasks · checked

    3.0L B58 turbocharged inline-six with 48-volt mild-hybrid system (382 hp / 369 lb-ft) — K&N 33-3136

    K&N 33-3136

    Manufacturer-catalog replacement-part fitment only; it does not establish a BMW service interval. Confirm the VIN, production date, engine, and installed filter dimensions before ordering.

    Applies to: 2021 · 3.0L B58 turbocharged inline-six with 48-volt mild-hybrid system (382 hp / 369 lb-ft) · M340i · United States · Exact model-year and engine-family catalog scope; verify VIN and production date before ordering.

    Source: K&N — current BMW 330i/M340i replacement air-filter catalog · 2021 BMW 330i/330e/M340i 2.0L/3.0L gasoline or plug-in hybrid — 33-3136 · checked

    Verified ordering references

    3.0L B58 turbocharged inline-six with 48-volt mild-hybrid system (382 hp / 369 lb-ft) — K&N 33-3136

    K&N 33-3136

    Manufacturer-catalog replacement-part fitment only; it does not establish a BMW service interval. Confirm the VIN, production date, engine, and installed filter dimensions before ordering.

    Applies to: 2021 · 3.0L B58 turbocharged inline-six with 48-volt mild-hybrid system (382 hp / 369 lb-ft) · M340i xDrive · United States · Exact model-year and engine-family catalog scope; verify VIN and production date before ordering.

    Source: K&N — current BMW 330i/M340i replacement air-filter catalog · 2021 BMW 330i/330e/M340i 2.0L/3.0L gasoline or plug-in hybrid — 33-3136 · checked

    Verified ordering references

  • Spark plugs

    Fitment must be confirmed

    BMW combines this task with the engine-oil service occurrence identified by the vehicle.

    Applies to: 2021 · United States

    Source: BMW USA service-and-warranty library — select 2021 Maintenance booklet · Maintenance Intervals — "combine with Engine oil" tasks · checked

Sources

  1. BMW of North America — model year 2021 update information

Other 2021 configurations

Filter all 2021 configurations →