Two years, antifreeze must be changed in two years, because the validity of antifreeze is generally two years, the expiration date of the antifreeze will cause corrosion of the cylinder block, and serious or even serious damage to the engine. In addition, the freezing point of antifreeze is generally about -25 ℃, if you go to a colder place also need to change the freezing point of lower antifreeze.
Antifreeze replacement notes:
1, according to the ambient temperature conditions to choose the freezing point of antifreeze. Antifreeze freezing point is one of the most important indicators of antifreeze, is the antifreeze can not freeze the important conditions. Antifreeze freezing point should be selected in the local environmental conditions of the lowest winter temperature -10 ℃ ~ 15 ℃ or so, such as the local minimum temperature of -30 ℃, the freezing point of antifreeze should be selected below -45 ℃.
If you want to choose the ethylene glycol mother liquor modulation can be prepared ethylene glycol concentration of 59%, the freezing point of -50 ℃, its density of 1.0786mg / cubic centimeter antifreeze.
2, antifreeze should be used with antirust, anticorrosion and descaling ability. Antifreeze is the most important anti-rust corrosion. So it is appropriate to use brand-name products, these products are added to the corrosion inhibitor, corrosion inhibitor, scale inhibitor and cleaning agent, product quality is guaranteed.
Expanded information:
Anti-freeze advantages:
1, corrosion prevention function: The engine and its cooling system are made of metal, copper, iron, aluminum, steel and solder. These metals in contact with water at high temperatures, time will be corroded, will rust. Antifreeze not only does not cause corrosion of the engine cooling system, but also has anti-corrosion and rust removal function.
2, the role of protection: the cooling system components to play a protective role in anti-corrosion, to prevent scale, to avoid reducing the role of the radiator heat. Ensure that the engine can work within the normal temperature range.
Reference:
This is the first time that an antifreeze has been used in an engine. Reference: