Engine coolant types and the difference between different colors

Engine coolant has properties to maintain engine parts and the cooling system, and these basic properties are summarized as follows:

1- Raising the boiling point of the coolant.
2- Reducing the freezing point of the coolant.
3- Preventing chemical corrosion in engine parts and cooling system.

These above-mentioned specifications are basic in all types of coolant, but the latter differ according to the types based on the materials that make up the engine and the cooling system. made by the manufacturers for each engine.
Coolants are classified according to their engine compatibility, by country of manufacture, manufacturer name and year of manufacture.
Types of cooling fluids are classified according to colors, including green, orange (pink) and yellow (golden).

The main component of the coolant is Ethylene Glycol (EG), which represents more than 90% of the coolant content. Chemical corrosion inhibitors are added, each according to the type of minerals that make up the engine and the cooling system, as follows:
Silicates are suitable for iron, aluminum and Add in green coolant.
• Phosphates, which are suitable for iron and aluminum, are added to the green coolant.
• Carboxylate organic acids are added instead of silicates and phosphates, and they are characterized by longevity, and the color of the coolant containing them is orange or (pink) and the commercially famous (DexCool).

A group of OAT technology, which is commercially known as (G-05), which contains the technology of organic acids in addition to a small amount of silicate, which has a positive effect on aluminum as it protects and treats minor surface defects of aluminum.
The shelf life of coolant varies during operation. The green type is valid for two years or 24000 miles, and the validity of the orange (pink) and yellow (golden) type is five years or 150,000 miles.
Conclusion: The recommendations for the type of coolant mentioned in the owner’s manual, which are of great importance in maintaining the engine, must be adhered to and followed by other types of fluids used in the vehicle such as engine oil, transmission oil and brake system oil.