The frequency of coolant replenishment depends on various factors, such as driving conditions, climate, and vehicle brand and model. Usually, it is recommended to replenish the coolant every 30000 miles or every three years (whichever comes first). However, it is recommended to refer to the owner's manual to determine the manufacturer's recommended maintenance intervals.

Regularly checking the coolant level is crucial to ensure that the engine operates at the correct temperature. A low coolant level may cause the engine to overheat, resulting in serious and expensive damage. Therefore, please make sure to check the coolant level regularly, especially before long-distance travel or during routine vehicle maintenance checks.