What are the consequences of using semi-synthetic oil for a year?

1 Answers
Hadley
07/29/25 4:48am
Semi-synthetic oil will deteriorate after one year of use, which can damage the engine. Replacement cycle for semi-synthetic oil: In most Chinese cities, semi-synthetic oil can be replaced every 7,500 kilometers or 9 months. If there is too much dust in the air, the temperature is very low (-20 degrees Celsius), or the car is frequently driven short distances (each trip is less than 8 kilometers), it is recommended to increase the oil change frequency to 5,000 kilometers or every six months. Shelf life of semi-synthetic oil: National regulations clearly state that the shelf life of sealed oil is generally within 5 years, and semi-synthetic oil also falls within this range. However, once opened, semi-synthetic oil deteriorates more quickly and should ideally be used within six months. Of course, how quickly semi-synthetic oil deteriorates also depends on the storage environment—the greater the temperature fluctuations and humidity, the faster the oil will deteriorate.
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