Is it normal for the coolant level to decrease?

[AndresLee]

It is normal for the coolant level to decrease. Here is additional information: 1. Coolant should be checked regularly. If it falls below the minimum level, it may cause unnecessary trouble. 2. Insufficient coolant can affect the cooling system and, in severe cases, may lead to engine damage. 3. In winter, a lack of coolant will significantly reduce its antifreeze effect, potentially freezing the radiator and affecting the vehicle's normal operation. 4. Coolant should generally be replaced every two years or 40,000 kilometers, though this is not absolute. Actual conditions should be considered—running a few extra thousand kilometers or delaying replacement by a year or two may not cause major issues. Note that different types of coolant should not be mixed, as chemical reactions may occur and damage the engine.