Oil Filler Cap 11121743294 For BMW E36 E34 E38 E39 X5 E90 E91

An oil cap, also known as an oil filler cap, is an essential component in a vehicle's lubrication system. The lubrication system is responsible for reducing friction and wear between moving parts in the engine. The oil cap is typically located on the engine's valve cover and serves as a seal for the oil system, preventing oil leaks and ensuring proper lubrication. It provides a convenient access point for adding or checking the engine oil level. The oil cap is designed to withstand high temperatures and pressures commonly found in the engine, ensuring the integrity of the lubrication system.

The primary function of an oil cap is to maintain the integrity of the engine's lubrication system. It seals the oil filler opening, preventing contaminants from entering the system and ensuring that the oil remains clean and free from debris. A secure and properly sealed oil cap also helps maintain the oil pressure within the system, ensuring optimal lubrication to all engine components. Additionally, the oil cap provides a visual indicator of the oil level, allowing drivers or mechanics to check and add oil as needed to maintain proper lubrication and prevent engine damage.