Engine oil is like a whistle. What happened?

1. If it is caused by airflow, check whether there is a gap between the intake manifold and the cylinder head, check whether the intake manifold is cracked, and check whether the pipeline from the throttle body to the air inlet is cracked. Also, check the exhaust side. Please check the exhaust manifold in particular. 2. If the belt is loose, there will be sharp periodic howling. Just tighten the belt, or you can consider changing the belt for too long, and you can consider changing it after running for 50,000 to 60,000.