Antifreeze

Antifreeze is a liquid that is mixed with water and added to prevent coolant from freezing. Types of antifreeze that inhibit corrosion and do not need to be replaced for long periods are called long life coolants (LLC). These types are currently widely used.
Long life coolants contain ethylene glycol as their main component and also contain a high concentration of corrosion inhibitor. They are used by being mixing with fresh water. They not only prevent engine damage and blockages to water passages caused by the freezing and expansion of coolant in winter, but also prevent the corrosion of the metal components of the cooling system.
Because normal antifreeze does not inhibit corrosion, but instead accelerates corrosion, it must be drained every season. However. long life coolant can be used for long periods of time (two years) in all seasons.