What is the Difference Between Red and Green Antifreeze?

The main difference between red and green antifreeze lies in their chemical composition and the types of radiators they are designed for. Here are the key differences:

1. Chemical Composition: Green antifreeze is a conventional coolant with an ethylene glycol base, while red antifreeze is typically based on Organic Acid Technology (OAT).
2. Radiator Compatibility: Red antifreeze is designed to be suitable for aluminum radiators, while green antifreeze is less stable and not recommended for use in aluminum radiators.
3. Additives: Green antifreeze usually contains additives such as silicates or phosphates, while red antifreeze is often silicate and phosphate-free.
4. Cooling System Treatment: When mixing red and green antifreeze, you must treat the cooling system as if it has regular green antifreeze in it. Mixing them can cause the cooling system to become acidic and potentially damage the head gasket.
5. Lifespan: Red antifreeze lasts longer than green antifreeze.

It is essential to read your car's owner manual before adding any coolant to your vehicle to ensure compatibility with your specific model.

Comparative Table: Red vs Green Antifreeze

The main differences between red and green antifreeze are their types, lasting period, and additives used to produce them. Here is a comparison table highlighting the key differences:

Red antifreeze uses OAT and is also known as Dex-Cool, while green antifreeze uses IAT and is known as regular antifreeze or conventional. Red antifreeze is propylene glycol, and green antifreeze is ethylene glycol. Red antifreeze is used in modern engines, and green antifreeze is used in older engines. Red antifreeze lasts longer than green antifreeze and is more expensive.