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What is the difference between red and green antifreeze?

1 Answers
LeConnor
07/29/25 12:48pm
There is essentially no difference between red and green automotive antifreeze. Antifreeze itself is a colorless and transparent liquid, and the different colors are due to dyes added to the liquid. The bright colors are simply meant to help users distinguish between different types of antifreeze during selection, preventing the mixing of different antifreeze types, which could damage the engine. Below is a related introduction to antifreeze: The main components of antifreeze are ethylene glycol, propylene glycol, and diethylene glycol. Ethylene glycol is generally green, propylene glycol is red with a hint of orange, and diethylene glycol is blue. The chemical properties of antifreeze can vary significantly depending on the color and brand, and their compositions also differ. Currently, ethylene glycol antifreeze is widely used in the market, with some phosphate-based variants available. If these two types of antifreeze are mixed, they can produce highly corrosive substances, causing significant damage to the engine. Even if the main components are the same, if the minor components differ, mixing is still not advisable. Therefore, when switching to a different brand of antifreeze, it is necessary to flush the system before refilling. Especially during summer use, never replace antifreeze with tap water or other liquids, as this can cause severe damage to the engine. The color of antifreeze is artificially added and should not be used as a criterion to evaluate its quality. When selecting antifreeze, choose based on the local temperature, generally ensuring it is at least 10 degrees Celsius below the region's lowest temperature.
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