Adding water will cause the engine cooling system to easily produce scale, corrode internal devices, and the water will not dissipate heat well, and the water pump will not be lubricated, which is easy to break down (cooling water has a certain lubricating effect). Special cooling water can solve these problems. Generally above 200 yuan. Change it every three years or 5W kilometers.
(From Shenzhen Biaohui Buick Chevrolet Automobile Maintenance Center)