Choosing the right engine coolant for a car depends primarily on the vehicle manufacturer’s recommendations, which are typically found in the owner's manual. The type of coolant is often categorized by its chemical technology and indicated by color. Common types include:
- Inorganic Additive Technology (IAT) — typically green, used in older vehicles.
- Organic Acid Technology (OAT) — comes in colors like orange, red, or yellow, used mostly in newer models.
- Hybrid Organic Acid Technology (HOAT) — may be yellow, turquoise, or purple, combines properties of IAT and OAT and used in various modern vehicles.
Coolant can come concentrated (requiring dilution with water) or pre-mixed (ready to use). It is crucial to avoid mixing different types or colors of coolant as it can cause corrosion and damage. Always ensure that the coolant is compatible with your car’s engine materials such as gaskets and hoses. In summary, the best approach is to check the vehicle’s manual for the exact coolant type and color recommended by the manufacturer. If the manual is unavailable, search by car make, model, and year at a trusted auto parts retailer or consult a professional mechanic. Using the correct coolant not only protects the engine from overheating and freezing but also prevents corrosion and extends the life of the cooling system. Regularly checking and replacing the coolant as per maintenance schedules is also essential to maintain engine performance and durability.