How Often Should Antifreeze Be Replaced?

[ODavid]

The replacement interval for antifreeze varies slightly depending on the brand and model of the vehicle, as standards differ among manufacturers. Generally, the replacement cycle for antifreeze falls within the range of every 2 years or 40,000 to 60,000 kilometers. Antifreeze serves multiple purposes, including preventing freezing, scale formation, boiling, and corrosion. If the antifreeze exceeds its effective period, its ability to prevent scale and corrosion diminishes. There are two clear indicators that antifreeze needs replacement: 1. The freezing point of the antifreeze increases: for example, antifreeze that originally protected down to -25 degrees Celsius now only protects to -35 degrees or higher; 2. The color of the antifreeze changes: the once vibrant color becomes cloudy. Antifreeze that hasn't reached its replacement interval doesn't need to be changed unless there's a cooling system leak, and tap water has been added to the antifreeze as an emergency measure. In such cases, after addressing the leak issue, the antifreeze should be replaced.