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More Information. Promos My Cars Rewards. Jan 5, Don't miss out on new content. Leave this field blank. Please enter a valid email address. Set Password. You already have a Team Valvoline account. Sign in here. Did you forget your password? Share Share Tweet Tweet. The cooling system in your car works by sending the coolant through passages in the engine block and heads. As the coolant flows through these passages, it picks up heat from the engine. The heated fluid then makes its way through a rubber hose to the radiator in the front of the car.
As it flows through the thin tubes in the radiator, the hot liquid is cooled by the air stream entering the engine compartment from the grill in front of the car. Once the fluid is cooled, it returns to the engine to absorb more heat.
The water pump has the job of keeping the fluid moving through this system of plumbing and hidden passages. Different types of engine coolants are specifically engineered for different types of vehicles. Coolant varieties are categorized by name and color.
You should always use the variety recommended for your car. Six types of engine coolant are:. IAT engine coolant is green. It is made with ethylene glycol with silicate and phosphates added to prevent corrosion. As an older formula, it is not as efficient as some newer types of engine coolant. If your car requires IAT coolant, you will need to flush it and replace it approximately every two years or every 24, miles.
OAT engine coolant is made with a propylene glycol base. Organic acid technology OAT engine coolant is usually orange in color, but it can come in other colors like dark green. Always double-check the label to ensure you do not accidentally grab a color that is a different coolant type. OAT uses organic acid to help protect your engine from corrosion. As a more modern formulation, OAT coolant only needs to be drained and changed every five years or every 50, miles.
Hybrid organic acid technology is one of the three main categories of engine coolant, and it has several subcategories. HOAT coolant was traditionally yellow.
You can find HOAT coolant in yellow, orange, green, pink and blue. HOAT uses both silicates and organic acid to protect your engine and combat corrosion. It should be swapped out at the same interval as OAT coolant: every five years of every 50, miles. Phosphate-free HOAT is usually turquoise in color. This NAP-free formula, made with ethylene glycol, contains organic and inorganic corrosion inhibitors to protect your engine.
It does not contain phosphates, such as nitrite, nitrate and borate. It is also a low-silicate formula. The coolant is usually either pink or blue.
Due to heat transfer issues, Asian car manufacturers require the use of this type of coolant. Silicated HOAT is usually recognizable by its vibrant purple color. It uses silicates and organic acids to inhibit corrosive action in your engine.
Its formula is free of nitrites, nitrates, phosphates, borates, amines and imidazole. Instead, it uses silicate, organic technology. The coolant offers protection for five years or , miles in the case of light application. In the case of heavy applications, this formula protects for three years or , miles. If you are committed to DIY engine coolant maintenance, make sure you keep track of your miles and your time. Proactive maintenance means a happier car, a happier driver and a happier wallet.
Note, if your car has been retrofitted with newer or different parts, this could affect the type of coolant it needs. Always do your research to ensure your car is kept in the best running condition as possible. The best engine coolant for your car depends on the vehicle type, age and place of manufacture.
Know the make and model and year of your vehicle will help you select the right coolant. Choosing the wrong product can result in poor performance or worse instant engine failure.
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