Coolants Explained

Coolant is used to control engine temperature and protect the cooling system. While it is not a lubricant in the same way as oil or grease, it plays a critical role in overall engine protection and reliability.

Without correct coolant performance, engines can overheat, corrode internally, or suffer long term damage.

What coolant does

Coolant circulates through the engine and radiator to remove excess heat. It helps keep the engine operating within a safe temperature range under all driving conditions.

It also protects internal cooling system components from corrosion and scale build up.

Why water alone is not enough

Water can absorb heat, but it does not protect against corrosion or freezing. It can also boil at relatively low temperatures under engine conditions.

Coolant contains additives that raise boiling point, lower freezing point, and protect metals within the cooling system.

Antifreeze properties

Most coolants are based on antifreeze compounds mixed with water. These compounds help prevent freezing in cold conditions and boiling in high temperatures.

They also contain corrosion inhibitors designed to protect aluminium, steel, and other metals used in modern engines.

Cooling system compatibility

Different vehicles require different coolant formulations. Additive packages vary depending on engine design and materials.

Using the wrong coolant can reduce corrosion protection or cause additive incompatibility within the system.

What coolant is not

Coolant is not interchangeable with engine oil or other vehicle fluids. It does not provide lubrication for moving engine parts.

Its role is temperature control and system protection, not friction reduction.