Drain Plug is located usually in the side of the Oil Pan. The Drain Plug will normally look like a large bolt and when it is loosened Oil will come out of the Oil Pan. To find the Drain Plug, look all around the side of the Oil Pan and see if you can see a bolt sticking out the side of it. To be able to view the Oil Pan you may need to raise the front of the car (Back for Rear-Engine Cars). Whenever you raise a vehicle, make sure to secure the vehicle from coming down on you by using wheel chocks, emergency brake, engine off, jack stands (axle stands) and ramps as needed. Failure to secure the vehicle from moving can result in serious injury or death.
Drain Plug allows oil to be drained out of the Oil Pan so that Oil can be changed. If the engine kept using the same oil, the oil would go bad and damage the engine. Always make sure there is a container of some sort to capture Oil if you plan to remove the Drain Plug. The container will need to be able to hold several quarts of Oil. Putting a piece of cardboard under the container can help with Oil spills.
Drain Plug can leak for several reasons: