Almost all antifreezes are called “permanent” and are made primarily from ethylene glycol. Nonpermanent antifreeze is made primarily of methyl alcohol, which evaporates. The ethylene glycol, while preventing water from freezing, also serves as a coolant because of its high heat transfer qualities. As an example, one major brand of antifreeze mixed with equal parts of water will lower the freezing point to -34°F and raise the boiling point to 260°F.
It can be used year-round. Compact automobiles, with their highpowered engines and low-capacity radiators, require the use of coolants, and all major automobile manufacturers add permanent antifreeze at the factory. Antifreeze containers should list the amount of antifreeze required according to radiator capacity and temperature level required. Manufacturers recommend that permanent antifreeze be changed every two years.
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