Can Antifreeze Be Mixed for Use?
2 Answers
Antifreeze cannot be mixed. Two different types of antifreeze additives must never be mixed together, as different brands of antifreeze have varying chemical compositions. Mixing them can easily lead to chemical reactions, which may severely damage rubber seals, often resulting in leaks at the water pump seal or welded joints. Precautions for Mixing Antifreeze: Use the same brand of antifreeze. Different brands of antifreeze may have different production formulations. If mixed, various additives may react chemically, rendering them ineffective. Antifreeze Replacement Cycle: For vehicles that operate for long periods, such as taxis, high-quality antifreeze should generally be replaced once a year. For vehicles with shorter operating hours, replacement can be done every two years or every 30,000 kilometers. To prevent excessive foam formation, which reduces the heat exchange efficiency between the antifreeze and engine components, ensure the product is within its validity period when adding it. Long-lasting antifreeze can remain effective for up to three years. If suspended particles, sediment, or signs of spoilage or discoloration are observed in the antifreeze, replace it promptly and clean the system.
I really want to remind everyone about this issue - you absolutely cannot mix coolants randomly. Last time, my friend saw the radiator warning light on the highway and casually bought a different brand of coolant at a service area to top it up. In less than two days, the engine started showing high-temperature warnings. Coolants from different brands vary greatly in composition - some are ethylene glycol-based while others use propylene glycol, not to mention completely different additive formulations. Mixing them can cause sediment buildup that clogs water passages, corrodes metal components, and even damages water pump seals. In emergencies, it's better to add distilled water than to mix coolants randomly, but you must do a complete flush and replacement as soon as you get home. I recommend checking the freezing point and fluid level before each winter, and ideally doing a full replacement with the OEM-specified type.
