Can blue and red antifreeze be mixed?

[OJocelyn]

Blue and red antifreeze cannot be mixed because they have different additive formulations. If mixed, various additives may undergo chemical reactions, leading to additive failure, compromising their comprehensive anti-corrosion capabilities, and causing hazards such as sedimentation, scaling, and corrosion, which can affect the engine's lifespan. To ensure the normal operation and longevity of the engine and cooling system, the following points should be observed: 1. Use the same brand of antifreeze whenever possible; different brands should not be mixed. 2. Most antifreeze products have a validity period of two years, so ensure the product is within its validity period when adding. 3. Regular replacement is necessary, typically every two years or every 40,000 kilometers. When replacing, drain the old fluid completely, clean the cooling system thoroughly, and then add new fluid. 4. If antifreeze is low or absent, avoid diluting it with tap water for continued use.