How Often Should Engine Oil Be Changed If the Car Is Not Driven for a Long Time?
2 Answers
If the car is not driven for a long time, the engine oil change interval depends on the type of oil: 1. Mineral oil needs to be changed every 5,000 kilometers or 3 months; 2. Semi-synthetic oil requires replacement every 7,500 kilometers or 6 months; 3. Full-synthetic oil should be changed every 10,000 kilometers or 1 year. The engine oil should be filled between the marks on the dipstick, preferably below the upper limit. During driving, engine oil may leak due to bumps, so it should not be overfilled. When selecting engine oil, consider factors such as the car model, season, climate, engine displacement, and technical performance.
My car sits idle most of the time, and veteran drivers told me engine oil should be changed at least once a year. Even if you haven't driven many kilometers, prolonged storage causes oil to degrade inside the engine—oxidation reduces lubrication efficiency, and moisture absorption from the air can create condensation. My neighbor's car sat untouched for nine months, and the engine sounded rough upon startup. It's best to check the dipstick every six months; if the oil appears blackened or smells acidic, address it immediately. Always cover the car to minimize dust intrusion, and parking in a garage protects the vehicle better than leaving it exposed. Don't risk engine damage to save a few hundred bucks—major repairs would cost far more.
