Locate the drain plug underneath the vehicle, remove it as directed by your owner's manual, and drain the oil from the engine into a pan that is large enough to hold the entire contents of the crankcase (most passenger cars hold about 5 quarts of oil). Make sure the drain pan is positioned properly to catch all of the used oil from the engine. (Note: The oil may be hot, so use caution when draining it from the engine. Consider wearing rubber gloves for protection.)