What are the consequences of mixing coolants?

[JessicaDella]

Mixing coolants of different brands can easily cause chemical reactions, which may damage rubber seals and lead to water leakage at the water pump seal and welding seams. Here are some precautions for coolant usage: 1. Adding: Generally, the coolant should be filled between the MAX (highest water level) and MIN (lowest water level) marks, and it should be added when the car is stationary. Adding coolant to a hot engine may result in inaccurate water level readings. 2. Replacement cycle: Coolant needs to be checked and replaced regularly. For most family cars, it should be replaced every two years or approximately 40,000 kilometers, depending on the actual usage of the vehicle.