The recommended driving mileage after an oil change should be comprehensively determined based on the oil type and driving conditions. Mineral oil typically requires replacement every 5,000 to 7,500 kilometres or every six months; semi-synthetic oil can be extended to 7,500 to 10,000 kilometres or 8 months; while fully synthetic oil allows for a replacement interval of 10,000 to 15,000 kilometres or one year. For turbocharged models or vehicles older than five years, it is advisable to opt for high-viscosity fully synthetic oil and shorten the replacement interval to 8,000 to 10,000 kilometres. Oil degradation can be assessed through test strip analysis (darkened oil rings or visible contaminants), noticeable power lag, or alerts from the vehicle's monitoring system (remaining oil life ≤ 20%). Once opened, the shelf life is six months for mineral oil, 8 to 10 months for semi-synthetic oil, and one year for fully synthetic oil. Note that aggressive driving habits may accelerate oil degradation by 30%, whereas premium fully synthetic oils meeting API SP/SN standards may achieve up to 12,000 kilometres under ideal conditions-though actual intervals should be adjusted based on regular inspections of oil level and quality.
