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Your coolant is orange because the manufacture added orange dye to the coolant so it is easily recognized. Orange coolant is Organic Acid Technology (OAT) coolant and should not be mixed with Green coolant which is Inorganic Additive Technology (IAT) coolant. Yellow coolant is Hybrid Organic Acid Technology (HOAT) coolant. IAT must be changed about every 2 years, but OAT and HOAT will last 10 years or 100,000 miles. Never mix these coolants together.

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14y ago

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