The oil change interval for a car engine needs to be determined based on a comprehensive assessment of the oil type, driving environment, 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. In hot climates or during frequent short-distance driving, the oil tends to deteriorate faster due to high temperatures or insufficient warm-up, so it is advisable to shorten the interval by 10%-20%. If the vehicle is parked for more than 3 months or driven aggressively (e.g., frequent rapid acceleration), it is also necessary to inspect or replace the oil in advance. Car owners can assess the oil condition by observing its colour (deep black and dull), texture (thin or gritty), or unusual engine noises. Timely maintenance can prevent engine wear and reduce fuel consumption. For cars older than 8 years, due to increased component wear, It is best to reduce the oil change interval by 20% to ensure proper lubrication.
