BMW i3 Range Extender REx Engine Failure
BMW
3 Series
2014
C650 650cc REx
⚡ 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 650cc range extender engine on i3 REx requires oil changes every 30,000 km — it has a very small oil capacity and degrades rapidly. The engine can seize if oil is neglected. Oil change every 30,000 km or annually, whichever is first.
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 2014 problem, submit a wrong diagnosis report — it helps other drivers avoid the same costly mistake.
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