Where is the engine oil drain plug generally located?

[VonHector]

The engine oil drain plug is generally located at the oil pan. This design facilitates thorough oil drainage and cleaning of the oil pan. It can be removed using a square or hex socket wrench. If the plug is difficult to loosen, you can apply some penetrating oil. If penetrating oil is unavailable, engine oil can be used as a lubricant. The drain plug itself usually doesn't need replacement - only its washer requires changing. A few vehicle models use plastic oil pans with disposable drain plugs that need replacement every time. The washer creates a seal through compression and helps prevent loosening or detachment caused by vibration.