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What is the difference between red and green coolant?

1 Answers

VanLondyn

07/29/25 5:55pm

The difference between red and green coolant lies in their properties: red coolant is G11, while green coolant is G12. Ethylene glycol-based coolant is green, propylene glycol-based coolant is red or orange, and glycerol-based coolant is blue. The color is due to dyes added to the liquid, serving only to distinguish it from other liquids without any other special functional purpose. This helps car owners differentiate when selecting coolant, preventing the mixing of different types of coolant, which could damage the engine. Another purpose is to prevent accidental ingestion. The color of the coolant is not inherently linked to its performance or quality. Multi-purpose coolant is often prepared in a distinct fluorescent green mainly to facilitate leak detection.

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