BMW N52 3.0: Specs, Engine Codes, ECUs & Maintenance
BMW · Engine information · U.S. & Canada
N52
3.0 · Naturally aspirated · Valvetronic inline-six
The N52 combines a lightweight magnesium-aluminium crankcase with variable valve lift. Its smooth, linear delivery comes from breathing control and intake tuning, with several factory outputs from the same basic 3.0-litre layout.
Architecture
- Engine family
- N52B30 · N52K/KP · N52T
- Layout
- Inline-six · DOHC · 24 valves
- Construction
- Magnesium-aluminium crankcase · aluminium head
- Bore × stroke
- 85 × 88 mm
- Valve control
- Valvetronic II · double VANOS
- Timing
- Chain drive
Fuel & control
- Induction
- Naturally aspirated
- Injection
- Port gasoline injection
- Intake
- Fixed or multi-stage, by output version
- Cooling
- Electric main coolant pump
- DME supplier
- Siemens / Continental
- Controllers
- MSV70 · MSV80 · MSV90
Engine controllers · MSV70, MSV80 & MSV90
The MSV family controls Valvetronic lift, VANOS timing, ignition and port injection. The N52K and later N52T revisions brought different DME hardware and interfaces; horsepower alone does not identify them.
| Controller | Applications & timing | Technical distinction |
|---|---|---|
| MSV70 | Original N52: E90 325i/330i (2006), E60 525i/530i (2006–2007), and early N52 Z4/X3 applications | Initial N52 electronics, including variable valve lift and electric coolant-pump control. |
| MSV80 | N52K/KP: E9x 328i from 2007, E60 528i (2008–2010), E70 X5 3.0si (2007–2010) | Revised digital air-mass meter and throttle interfaces. Hardware and engine-harness differences prevent treating it as an MSV70 software update. |
| MSV90 | N52T: F10 528i (2011) and F25 X3 xDrive28i (2011–2012) | Later controller used with the N52T and F-series vehicle electronics. Separate software family from MSV80. |
A 328i badge may also identify an N51 SULEV engine. Confirm the engine/emissions label, DME hardware number and software before selecting parts or a calibration.
Selected U.S. & Canadian vehicles
| Model | Chassis | Model years | Engine / factory output |
|---|---|---|---|
| 325i/xi · 330i/xi | E90 | 2006 | N52B30 · 215/185 or 255/220 hp/lb-ft |
| 525i/xi · 530i/xi | E60 | 2006–2007 | N52B30 · 215 or 255 hp |
| 328i / xDrive | E90/E91/E92/E93 | 2007–2013, body dependent | N52 versions · 230 hp / 200 lb-ft |
| 528i / xDrive | E60 / F10 | 2008–2010 / 2011 | 230 hp / 200 lb-ft; F10: 240 hp / 230 lb-ft |
| X3 3.0si / xDrive30i · X5 3.0si/xDrive30i | E83 / E70 | 2007–2010 | N52B30 · 260 hp / 225 lb-ft |
| X3 xDrive28i | F25 | 2011–2012 | N52T · 240 hp / 221 lb-ft |
| Z4 3.0i / 3.0si · sDrive30i | E85/E86 / E89 | 2006–2008 / 2009–2011 | Output depends on model |
The 325i name does not mean a 2.5-litre engine in these U.S. applications. Intake hardware, emissions version and calibration determine the factory rating.
Common issues & key risks
Electric water pump. Pump failure can produce a loud cooling fan, temperature warnings and reduced power. Read pump faults and check circulation and thermostat operation before continued driving.
Oil leaks & PCV. Valve-cover and filter-housing seals leak with age. Later plastic covers also contain the breather; whistling, rough idle or abnormal crankcase vacuum can point to PCV failure.
Eccentric-shaft sensor. Oil contamination at the sensor connector can cause Valvetronic faults, rough running or a no-start. BMW specifies checking the sensor and associated wiring for oil.
VANOS faults. Dirty or faulty solenoids can affect cam control; persistent faults may also involve oil supply or cam-bearing-ledge wear. Test before replacing parts.
DISA mechanisms. On engines with the variable-length intake, failed flap mechanisms can cause rattles and reduced torque. Confirm the fitted intake version before ordering parts.
Keep it consistent: Use the oil approval in the vehicle handbook, maintain oil level and cooling-system condition, and investigate warning lights before continued hard use.
References
| Topic | Source |
|---|---|
| Engine design | BMW Engine Technology training |
| Original U.S. outputs | BMW 2006 3 Series launch |
| N52T specifications | BMW F10 Complete Vehicle training |
| Diagnostic applications | BMW SI B12 13 11 |
| Electric-pump failures | FCP Euro · N52 pump repair |
| Valvetronic sensor | BMW SI B11 06 16 |
| Cam-control diagnosis | FCP Euro · cam-bearing-ledge wear |
| Valve-cover leaks | FCP Euro · N52 cover repair |
| Photograph | N52 · IntelPentiumMMX · CC BY-SA 4.0. Wikimedia Commons. |
Model years refer to selected U.S. and Canadian applications. Equipment and software vary by build. Use current BMW service information for diagnosis and repair.
