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The recommended coolant for the 2018 Hyundai Tucson is specified in the factory manual as Phosphate Organic Acid Technology, specifically the Red/Pink Extended Long Life for Asian Vehicles in a 50/50 mixture. The coolant isn't used to cool the engine, but to prevent rust build-up in the cooling system and lower the freezing point. Different engines require different coolant ingredients to prevent rust, as engine blocks are made from various metals. It is advised to flush the coolant system every five years or 100,000 miles. This new longer-lasting coolant replaces the older version, which used to last about 3 years or 24,000 to 36,000 miles.
For a 2018 Hyundai Tucson, it is advised to use authentic Hyundai fluid 00232-19010 long-lasting coolant as the preferred coolant type.