An oil change is when you change the oil of your car. An oil change is merely the process of removing the old oil and the old oil filter, and putting new oil (and a new oil filter) back into the car. Once in a while, cars need to have an oil change because their oil gets used too much and needs to be changed, much like a blood vessel for a human body. Doing an oil change on a regular basis is one of the most important steps you can take to keep your car in good running condition.
If you want to learn more about the properties of oils and their benefits, you can watch our video on what oils are.