An oil change is a routine maintenance procedure where old engine oil is drained and replaced with fresh oil. This helps to lubricate the engine, reduce friction, and remove dirt and debris that can accumulate over time. Regular oil changes are essential for keeping your engine running smoothly and prolonging its lifespan. It is recommended to have an oil change every 3,000 to 5,000 miles, depending on the type of oil and driving conditions. Neglecting to change your oil can lead to engine damage and costly repairs in the long run.