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Formulated to meet or exceed the performance requirements of every major car and truck manufacturer in order to provide maximum protection.

What is Antifreeze?

Antifreeze, also known as engine coolant or radiator fluid, is a glycol based liquid that is used in the radiator of a vehicle’s engine to maintain its temperature.

What Does Antifreeze Do?

Antifreeze, as its name implies, prevents the water in an engine's radiator from freezing in colder temperatures. When referenced as a coolant, the liquid functions as a convective heat transfer to prevent overheating of a vehicle’s engine.

Where Does Antifreeze Go?

Antifreeze goes into the radiator of a vehicle's engine. Click here to visit the PEAK® DIY Hub to learn more about antifreeze and radiator flushes.

What is Antifreeze Made Of?

Antifreeze has different chemical compositions depending on the type of antifreeze used. Inorganic Acid Technology (IAT) antifreeze can be either ethylene glycol (EG) or propylene glycol (PG). Organic Acid Technology (OAT) antifreeze is primarily ethylene glycol (EG) based. Hybrid Organic Acid Technology (HOAT) antifreeze is a combination of Inorganic Acid Technology (IAT) and Organic Acid Technology (OAT).

What Color is Antifreeze?

Antifreeze colors include red, orange, yellow, pink, blue and green. Different colored antifreeze is used to identify the type of antifreeze being used. Inorganic Acid Technology (IAT) antifreezes are green in color. Organic Acid Technology (OAT) antifreezes are orange, red, green, pink or blue. Hybrid Organic Acid Technology (HOAT) antifreezes are orange or yellow in color.

How Do You Check Your Antifreeze? How Much Antifreeze Do I Use?

Antifreeze can be checked by opening the radiator cap and seeing whether the liquid reaches the Full line.

How Do You Dispose of Antifreeze?

Antifreeze can be disposed of legally and safely by taking it to any major auto parts store.


Antifreeze can be disposed of legally and safely by taking it to any major auto parts store.

Radiator Fluid

Radiator fluid is the name given to the specific application of coolant. Often radiator fluid, antifreeze, and engine coolant are used interchangeably. Not all coolants or antifreeze are made for use in radiators.

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