What is the fault of BMW three-series valve cover leaking?

Report the failure of damaged bonnet and aging valve sealing ring.

1. Valve cover is damaged: the valve cover is used to cover the valve cover. If the valve cover is damaged or aged, it will lead to air leakage, which is usually caused by long-term use or high temperature.

2. Aging of valve chamber sealing ring: The valve chamber sealing ring is a component used to seal between the valve cover and the valve chamber. If the sealing ring is aged or damaged, it will lead to air leakage in the valve chamber.