The oil filler cap is a component that fits over the oil filler tube and covers the hole where the engine oil flows. It maintains the oil in the oil pan and blocks out any leakage.
Oil filler cap conceptThe oil filler cap has the function of housing the hole where the oil is flowing in. It is composed of materials such as plastic, aluminum, rubber, or metal. This component can come in a direct fit so that it only fit your vehicle, whereas the universal fit can be installed into various vehicles.
The oil filler cap is quite small but it is very essential because it keeps dirt and other contaminants from accessing the oil. When it is placed on the valve cover, it prevents oil from splashing out of the oil fill hole.
Common problems with a faulty oil filler capA faulty oil filler cap can lead to oil leaking and can get all over the engine components, and dirt or debris can be sucked in.