The engine coolant in your vehicle needs to be flushed regularly because it loses its effectiveness to lubricate the water pump and other important coolant system components. New coolant will also help reduce foam and rust throughout the coolant system. Over time your coolant may not be capable of properly cooling your engine because of its pH level, Glycol % and clarity. We recommend flushing your cooling system every 30,000 miles. We also check the pH level everything we see your vehicle.