•An engine oil cap, also known as an oil filler cap, is a part of the engine oil system that seals the opening where you add motor oil to the engine.
•A properly functioning oil filler cap is important because:
•Prevents oil leaks
•A damaged, loose, or worn cap can allow oil to leak out, which can lead to a significant loss of oil over time.
•Maintains oil levels
•A car needs a certain amount of oil to run, and a loose-fitting cap can cause the vehicle to slowly lose oil. If you begin to lose large amounts of oil, your engine could be in serious trouble.
•Indicates engine issues
•A milky white substance on the ridges of the oil cap can indicate that the engine is experiencing serious trouble.