Genuine OEM BMW Engine Oil Drain Plug, part number 11137513050. This plug is used to seal the opening of the engine oil pan, preventing the loss of engine oil. It is typically made of metal and designed to withstand the pressures and temperatures within the oil system. This part comes with a copper crush washer to ensure a leak-free seal during oil changes. Genuine OEM drain plugs and washers are critical for preventing oil leaks and maintaining engine health.