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If the engine temperature rises excessively, this can lead to cylinder head gasket failure, fuel self-detonation and, in the worst case, engine seizure due to expansion and deformation of internal parts. There are sev…

If the engine temperature rises excessively, this can lead to cylinder head gasket failure, fuel self-detonation and, in the worst case, engine seizure due to expansion and deformation of internal parts.

There are several types of antifreeze or coolant liquids, but to ensure the proper functioning of the cooling system it is essential to use the one recommended by the manufacturer.

These are the different types of existing antifreezes according to their composition:

Organic antifreeze. It is made up of ethylene glycol and distilled or demineralised water. It is the most common coolant because it has several advantages: it is more durable, it is biodegradable, it generates fewer solid deposits, it has a low electrical conductivity and has a higher boiling point, preventing overheating and minimising the formation of metal oxides and the consequent corrosion of the different parts of the cooling system, such as the radiator, pipes, etc.

Inorganic antifreeze. It uses products such as silicates, which degrade over time and can cause failures in the cooling system. It has a low percentage of corrosion inhibitors and other additives, so its durability is more limited.

Hybrid antifreeze. Popular with many manufacturers. It is composed of ethylene glycol, glycerine, anti-foaming and anti-limescale additives and a neutralising reserve that protects the cooling circuit. It may also incorporate silicates to protect aluminium surfaces.

You should never mix these three types of antifreeze, as this can cause problems in the cooling circuit.

Depending on their degree of corrosion protection, antifreezes are classified as G11, G12, G12+, G12++ and G13. Only G12++ and G13 may be mixed.

Antifreeze fluids are distinguished by different colours. The most common colours are green, orange, yellow, blue and pink. However, this hint can be misleading because each brand uses a different colour code. Always rely on the vehicle manufacturer's manual or the type indicated on the car's expansion tank.

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