The oil drain plug is a big nut or plug that secures the drain hole at the bottom of the engine.
Oil drain plug functionThe oil drain plug prevents the engine oil from spilling and supplies an opening for draining when you are changing the oil. The oil drain plug is often overlooked but vital because it prevents the lubricant from leaking. The drain plug can be found at the lowest point of the oil pan and the vehicle. The plug must be in good condition to properly maintain the engine's lubrication.
Common problems with a faulty oil drain plugA defective oil drain plug can lead to poor sealing, leaking, or a lack of lubrication.