The oil change interval for vehicle engine oil should be determined based on the oil type, driving habits, and operating environment. Mineral oil is recommended to be changed every 5,000 kilometres or 6 months; semi-synthetic oil can be extended to 7,500 kilometres or 8 months; fully synthetic oil can last up to 10,000 kilometres or 12 months. If the vehicle frequently travels short distances (one-way < 5 kilometres), operates in high-temperature and dusty environments, or remains parked for over 3 months, it is advisable to reduce the interval by 10%-20%. For plug-in hybrid vehicles primarily operating in electric mode with infrequent engine use, the interval may be extended to 15,000 kilometres or 18 months, but regular oil condition checks are necessary. During a new car's break-in period, the first oil change is recommended at approximately 2,500 kilometres to eliminate metal particles. Regular inspections and appropriate adjustments to the oil change interval will effectively preserve engine performance and prolong its service life.
