The Oil Filler Cap is a small, round cap that is located on the top of the engine. It creates a seal between the engine and the atmosphere. It is used to seal the oil fill opening, which is where you pour the oil. The engine oil filler cap is to keep the oil inside the engine. The oil in the engine lubricates the moving parts and helps to keep them cool.Attributes:• Provides a visual indication of the oil level in the engine• Help prevent the evaporation of oilApplications:The Oil Filler Cap is used to prevent dirt and debris from getting into the engine.