A motor oil change is a routine maintenance task for vehicles that involves draining old oil and replacing it with fresh oil. This process helps keep the engine running smoothly by reducing friction and preventing wear. Regular oil changes can improve fuel efficiency and extend the life of the engine. Typically, motor oil should be changed every 3,000 to 7,500 miles, depending on the vehicle and the type of oil used. It's important to use the correct type of motor oil specified in the vehicle's manual. Additionally, changing the oil filter during this process ensures that contaminants are removed, promoting better engine health.