Why should engine coolant be changed periodically?

Engine coolant should be changed periodically to maintain optimal engine performance and prevent overheating. Over time, coolant can become contaminated with debris, rust, and scale, reducing its effectiveness in regulating temperature and protecting against corrosion. Regularly changing coolant helps ensure the cooling system operates efficiently and prolongs the lifespan of engine components. Additionally, fresh coolant contains additives that protect against corrosion and maintain proper pH levels, which are essential for the health of the cooling system.