This document provides instructions for how to change the oil in a car's engine. It outlines the 5 key steps: 1) jack the car up and place jack stands for support, 2) locate and remove the oil drain plug to drain the old oil into a pan, 3) remove and replace the oil filter, 4) pour in the recommended amount of new oil, 5) start the car and check for leaks before disposing of the used oil properly. Changing oil regularly is important for maintaining the engine.