BMW E90 320d 325d N57 Injector Copper Seal Leak
BMW
3 Series
2006
N57/M57 3.0d
⚡ Quick Summary
Severity Level
High
Safe to Drive?
✅ Safe to Drive
Safety Impact
No direct safety impact reported by owners
Urgency Level
🟠 Fix Soon
The copper sealing washers on N57/M57 injectors in E90 325d/330d degrade causing diesel to enter the rocker cover. Diesel smell in cabin and oil dilution confirm the fault. Six injectors require resealing. Cost: £500-900 for all six including labour and oil change.
Repair / Solution
No confirmed fixes yet. Share yours below.
⚠️ Wrong Diagnosis?
No commonly reported misdiagnoses for this fault yet. If you have replaced a part that did not fix this BMW 3 Series 2006 problem, submit a wrong diagnosis report — it helps other drivers avoid the same costly mistake.
🚗 More About This Vehicle
Explore more BMW models
📖 Related Repair Guides
Help other owners by sharing your experience.
Your real-world fix helps thousands of drivers worldwide. Takes 2 minutes.