What is best coolant to put in cadillac 2000 sts?

For a 2000 Cadillac STS, it's best to use a coolant that meets the GM specification, specifically Dex-Cool (orange coolant). This type is designed for extended life and helps prevent corrosion in the engine and cooling system. Always ensure that you mix it with distilled water in the appropriate ratio, typically 50:50, unless otherwise specified. Regularly check your coolant level and condition to maintain optimal engine performance.