How Often Should You Change the Antifreeze in Your Car?

[McCorbin]

Car antifreeze should be changed every two years or 40,000 kilometers, which is just a general guideline. The actual replacement interval depends on the specific usage conditions. For some commercial vehicles with higher mileage, the antifreeze replacement cycle may be shorter. Antifreeze, also known as coolant with antifreeze properties, is designed to prevent the coolant from freezing in cold winter conditions, which could otherwise cause the radiator to crack or damage the engine block or cylinder head due to expansion. Car antifreeze has a shelf life, typically around two years, though some high-quality, long-life variants can last up to five years or even longer. If the original antifreeze hasn't been changed for eight years but is still within its shelf life, appears clear without impurities or discoloration, it may still be usable. However, if impurities or discoloration are present, it indicates that the antifreeze has expired or oxidized, and its internal chemical composition may have degraded, making it unsuitable for use. In such cases, it is recommended to replace it promptly.