Coolants

Engine coolants are also known as antifreeze. Coolants are mixed water to keep the radiator from freezing in extreme cold and overheating in extreme heat.Coolants also protect metals and non-metallic elastomers in the engine and the cooling circuit, so you need to change them to prolong your engine’s life.

Keep learning here: https://www.pacificpetroleum.com.au/why-and-how-to-change-the-coolant-in-your-car/