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For a 1998 Cadillac STS, it's recommended to use a coolant that meets the GM specification, specifically an ethylene glycol-based antifreeze. The preferred type is a dex-cool coolant, which is typically orange in color. Ensure the coolant is mixed appropriately with water, usually a 50/50 ratio, for optimal performance and protection against corrosion and freezing. Always refer to the owner's manual for specific recommendations.

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