For a 2013 Hyundai Sonata, it's recommended to use an ethylene glycol-based coolant that meets the specifications of Hyundai's Long Life Coolant (LLC), which is usually a blue or pink color. Specifically, you can use a coolant that meets the ASTM D3306 or D4985 standards. Always check your owner’s manual for specific recommendations and ensure that the coolant is compatible with the existing fluid in your system.
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