Is it true that car antifreeze never needs to be replaced?

Auto antifreeze, also known as antifreeze coolant, which means coolant with antifreeze function, is a very important liquid. Antifreeze can prevent the coolant from freezing and cracking the radiator and freezing the engine cylinder block when parking in cold season. However, it is worth noting that antifreeze is not only used in winter. In the normal maintenance project of the car, the engine antifreeze needs to be replaced every year after driving, The replacement frequency of antifreeze for special vehicles should be high.

The antifreeze can be divided into many categories according to its composition, including calcium chloride, ethylene glycol, glycerin, and even lubricating oil, as well as sugar and honey, which are common in our daily life, can be used as the mother liquor of antifreeze. After adding an appropriate amount of pure soft water (water containing no or a small amount of calcium and magnesium ions, such as distilled water, uncontaminated rainwater, snow water, etc., whose total hardness component concentration of water quality is between 0-30ppm), It can become antifreeze in general sense. However, most of the antifreeze sold and used in China are glycol water-based.

How often should the antifreeze be replaced? For vehicles with high frequency of use, such as taxis, the high-quality antifreeze should also be replaced once a year, while for vehicles with low frequency of use, it should be replaced once every two years or about 30000 kilometers. In order to prevent excessive foam and reduce the heat exchange between the antifreeze and engine parts once, confirm that the product is within the validity period when adding it. The validity period of long-term antifreeze can be up to three years. In case of suspended matter, sediment or deterioration or discoloration in the antifreeze, the system shall be replaced and cleaned in time.

It is worth noting that antifreeze of different brands cannot be mixed because of the difference in production formula, because it is likely that many chemical components will react with each other, resulting in the failure of antifreeze. If you want to replace the new antifreeze, you need to drain the original antifreeze before you can replace it.