For a 2003 Mini Cooper S, it is recommended to use a high-quality ethylene glycol-based antifreeze that meets the BMW specification. Look for a coolant that is specifically designed for European vehicles, such as a 50/50 mixture of antifreeze and distilled water. It's important to ensure the coolant is phosphate-free to prevent damage to the engine and cooling system. Always check the owner’s manual for specific recommendations and guidelines.
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