What is the service life of fully synthetic engine oil?

[OLeah]

The service life of fully synthetic engine oil is 10,000 kilometers or one year. In reality, the lifespan of engine oil is not a fixed value, as there are many objective factors that can affect its longevity. For driving in most cities across China, fully synthetic engine oil can be replaced every 10,000 to 12,000 kilometers or once a year. If your environment is particularly harsh—such as heavy dust, extremely low temperatures below -20 degrees Celsius, or frequent short trips where each drive is less than 8 kilometers—it is advisable to shorten the oil change interval to every 7,000 to 8,000 kilometers if any of these three factors apply.