What happened to Hyundai Elantra throttle intake hose oil?

Hello, it should be that the waste gas valve is broken, which leads to the failure of oil-gas separation. So when you suck the exhaust gas, you bring the oil into the intake manifold. You need to replace the waste gas valve and clean the throttle valve. I hope it helps you. If you have any questions, please log in to Baichebao and ask me for further questions.