Can engine oil last 15000 km?

Regarding the question of whether engine oil can last for 15,000 kilometres, a comprehensive assessment should be made based on the oil type and vehicle operating conditions. Fully synthetic oil can theoretically support a 15,000-kilometre replacement interval under ideal conditions, but practical applications require careful consideration. The standard replacement intervals for mineral oil and semi-synthetic oil are 5,000 kilometres and 7,500 kilometres respectively. Although fully synthetic oil is nominally rated for 10,000 kilometres, the following stringent conditions must be met: prolonged steady-speed highway driving, no frequent start-stop cycles, stable ambient temperatures, and absence of dusty or humid environments. Turbocharged models or high-load driving (such as frequent heavy loads or hill climbing) should still adhere to the 10,000-kilometre upper limit, with potential reduction to 8,000 kilometres under extreme road conditions. Notably, most manufacturers' warranty policies maintain 10,000 kilometres as the maximum interval for fully synthetic oil changes, and exceeding this mileage may void warranty coverage.