BMW automotive engine families listed as M56. Specifications below retain the source's separate family and variant labels.
Family specifications
| Field | Reported value |
|---|---|
| Engine code | M56B25 |
| Configuration | Straight-six, petrol |
| Displacement | 2.5 L |
| Power | 135 kW (184 PS; 181 bhp) |
| Production | 2002–2006 |
| Emissions designation | SULEV |
BMW automotive engine directory
Design, development and variant notes
The M56B25 is a SULEV adaptation of the M54B25 for selected US states. Wikipedia lists E46 325i applications for model years 2003–2006, with market availability varying by state.
Its emissions equipment includes an intake hydrocarbon filter, metal fuel-system components, secondary-air monitoring and crankcase ventilation incorporated into the valve cover. The source describes a sealed in-tank pump and filter assembly.
Data adapted from the cited Wikipedia revision by Wikipedia contributors under CC BY-SA 4.0. Production dates and fitments reflect that revision; verify the exact engine code, market and vehicle before applying a specification.
Sources
Curated reference notes. Applicability follows the cited sources; hardware testing by this wiki is not implied.
- Wikipedia: List of BMW engines. Wikipedia contributors; CC BY-SA 4.0. Source revision oldid 1382309748; accessed 2026-11-10.
- Wikipedia: BMW M56. Wikipedia contributors; CC BY-SA 4.0. Source revision oldid 1348055876; accessed 2026-11-10.
Further Wikipedia-sourced details
The following additional information is drawn from the cited Wikipedia revision by Wikipedia contributors, available under CC BY-SA 4.0. An open-ended date reflects the source snapshot, not confirmed current production or fitment.
Additional technical and variant notes
The source describes stainless-steel tank and venting components, as well as a radiator coating intended to reduce ambient ozone. These are emissions-system features of the described US SULEV installation.