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. Over time, oil can become dirty and lose its effectiveness, which can lead to engine problems if not changed regularly. Typically, oil changes are recommended every 3,000 to 7,500 miles, depending on the vehicle and the type of oil used. During an oil change, the oil filter is also replaced to ensure that contaminants are removed from the engine. Regular oil changes can extend the life of the vehicle and improve fuel efficiency.