Here is a Yocan fan ask why the oil cartridge leaking.
My juice chamber leaked into the mod what can I use to clean the inside of the mod

1. May be defect oil cartridge. If you have a brand new one, try this one.
2. Check the e-juice is thin or not. If you filled the thin e-juice into your cartridge, most of time it will leaking. So, please check the e-juice type when you buy it.
3. Over drawing, the e-juice didn't vaporized when you inhale, then leaking from the airflow hole. So, please do not strong draw.