The frequency of car engine oil changes is determined by a combination of oil type, driving conditions, and vehicle condition. 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, and fully synthetic oil can last up to 10,000 kilometres or 12 months. If the vehicle is frequently driven short distances, operates in high-temperature or dusty environments, or undergoes aggressive driving, the interval should be shortened by 10%-20%. For plug-in hybrid vehicles primarily operating in electric mode with low engine usage, the interval can be extended to 15,000 kilometres or 18 months, but regular inspections are still required. For new cars during the break-in period, the first oil change is recommended at 2,500 kilometres, while vehicles parked for extended periods should have their oil changed every 6-8 months to prevent oxidation. Adhering to the maintenance manual's recommendations and adjusting based on actual usage can preserve the engine's performance and lifespan.
