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Because the manufacturer used a red dye instead of a yellow or green dye. Its called Dexcool and it is that cooler so can tell them apart dont mix them, and use dexcool as called for by GM. The coolant is red rather than green because it is not regular antifreeze. This is a special GM coolant known as DEXCOOL. Dexcool is a phosphate and silicate free coolant, coherently making it a more stable and longer lasting product.

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