How often should the coolant be replaced in an Audi A6L?

[OJanelle]

Audi A6 coolant should be replaced every two years or every 30,000 kilometers, with the specific replacement interval depending on actual vehicle usage conditions. The functions of coolant are as follows: 1. Provides anti-corrosion protection for components of the cooling system. 2. Prevents scale buildup, avoiding reduced radiator efficiency. 3. Ensures the engine operates within normal temperature ranges. Precautions for using coolant are as follows: 1. Use the same brand of coolant whenever possible. 2. Most coolants have a two-year effective period; ensure the product is within this period when adding. 3. Regular replacement is necessary; when replacing, drain all old fluid, thoroughly clean the cooling system, and then add new fluid. 4. Avoid diluting with water.