BMW 730d Oil Separator CCV Failure — White Smoke
BMW
7 Series
2002
M57N/M57N2 3.0d
⚡ Quick Summary
Severity Level
Medium
Safe to Drive?
🚫 Do NOT Drive
Safety Impact
Direct safety risk — affects safe operation of the vehicle
Urgency Level
🟡 Monitor Closely
The crankcase ventilation oil separator on M57 engines fails at high mileage, allowing oil mist to enter the intake in large quantities. Symptoms include white or bluish smoke from exhaust at idle and increased oil consumption. Not immediately critical but causes progressive turbo and intake fouling.
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 7 Series 2002 problem, submit a wrong diagnosis report — it helps other drivers avoid the same costly mistake.
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