The oil change interval for a car depends on a comprehensive assessment of the oil type, driving environment, and vehicle usage. Mineral oil is recommended to be changed every 5000 kilometres or 6 months, semi-synthetic oil every 7500 kilometres or 7-8 months, and fully synthetic oil can be extended to 10,000 kilometres or 1 year, but the "whichever comes first" principle should be followed. If the vehicle is used under severe conditions such as prolonged high temperatures, dusty environments, or frequent short trips, or if the engine has experienced malfunctions (e.g., overheating), the oil change interval should be shortened to 5000-7000 kilometres. For a new car in the break-in period, the first oil change is recommended at around 2500 kilometres to remove metal particles. Special attention should be paid to turbocharged models, which should use fully synthetic oil as a priority, and the corresponding oil filter should be replaced simultaneously to ensure optimal lubrication system performance. Regular maintenance not only prevents engine wear caused by deteriorated oil but also enhances fuel efficiency. It is recommended that vehicle owners strictly adhere to the manufacturer's maintenance guidelines.
