Should Dexcool be mixed with water?

Dexcool, which is an extended-life coolant, should not be mixed with plain water. It is designed to be used with a specific 50/50 mixture of Dexcool and distilled water to ensure optimal performance and prevent corrosion. Mixing it with tap water or other coolants can lead to chemical reactions that may cause engine damage. Always follow the manufacturer's recommendations for coolant mixtures.