An oil change is a routine maintenance task for vehicles that involves replacing the old engine oil with fresh oil. This process helps to 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. During an oil change, the old oil is drained from the engine, and a new oil filter is often installed. The new oil is then added, ensuring that it meets the specifications for the vehicle. This service is typically recommended every 3,000 to 7,500 miles, depending on the type of oil used and the vehicle's requirements.