Changing a car’s oil is necessary to maintain the health and longevity of the engine. Typically, car manufacturers recommend changing the oil every 5,000 to 7,500 miles, or every 6 months to a year, depending on driving conditions and the type of oil used. Regular oil changes help ensure proper lubrication of the engine components, remove contaminants that can build up over time, and contribute to optimal engine performance and fuel efficiency. It’s important for car buyers to adhere to these maintenance schedules to prevent engine damage and ensure their vehicle operates smoothly.