Update: 刚做了如下, 请帮忙分析一下子(详情见内)

1. 用scan tool 消掉CEL code.

2. Turned on engine and let it idle for 15 minutes, everything was fine.

3. Rev the engine for about 4-5 minutes, no oil light. No rpm meter on the dashboard so don't know the rpm, probably between 2k-3k.

4. Release gas paddle and let it idle, oil light turned on.

5. Rev the engine again, oil light went away, let it idle and oil light on again, rev again and light went away again...

Any idea???

Thanks...