Toyota genuine coolant regulates engine temperature and prevents corrosion, with specific formulations for different models. The Pink (Super Long-Life) is used in newer Toyotas, lasting up to 100,000 miles or 10 years, while the Red (Long-Life) is for older models, requiring changes every 30,000 miles or 2 years. Always use the correct, pre-mixed 50/50 formula for optimal performance.