320i / 325i 2.5 (N52)
2005–2011 · petrol · 2497cc · 218hp
Engine codes: N52
Reliability, common problems and owner reviews for the Bmw 3 Series E90 320i / 325i 2.5 (N52). Check this before you buy used.
The naturally-aspirated straight-six — one of BMW's most dependable modern engines, smooth and long-lived. The known weak points are wear items rather than design killers: electric water pump, plastic thermostat housing and a couple of oil-leak gaskets.
Known Issues
Electric water pump fails ~130,000–190,000 km, risking overheating.
Fix / Workaround: Replace proactively (pump + thermostat).
Repair cost: €300–€700
Typically appears after: 130,000 km
Plastic thermostat housing cracks; valve-cover and oil-filter-housing gaskets leak.
Fix / Workaround: Replace housing/gaskets.
Repair cost: €150–€600
Typically appears after: 110,000 km
Mileage Thresholds
After 250,000 km: Long-lived with cooling/gasket upkeep.
Pre-Purchase Checklist
- ☐Check cooling system / water pump history
- ☐Inspect for oil leaks
- ☐The smart petrol choice
Frequently asked questions
Is the Bmw 3 Series E90 320i / 325i 2.5 (N52) reliable?
Reliable — The naturally-aspirated straight-six — one of BMW's most dependable modern engines, smooth and long-lived. The known weak points are wear items rather than design killers: electric water pump, plastic thermostat housing and a couple of oil-leak gaskets.
What are the common problems and reviews for the Bmw 3 Series E90 320i / 325i 2.5 (N52)?
The most commonly reported problems: Electric water pump failure, Thermostat housing / oil leaks.
Is a used Bmw 3 Series E90 320i / 325i 2.5 (N52) worth buying?
Minor issues only, easy to maintain, no design flaws. A safe used buy.