What is the shelf life of unopened antifreeze?

[MacCamilla]

Unopened antifreeze has a shelf life of two years; long-life antifreeze can last even longer, up to three to five years. The specific shelf life can be checked on the packaging. Antifreeze replacement cycle: Vehicle antifreeze generally needs to be replaced every 2 years or 40,000 kilometers. This is just a reference cycle. For commercial vehicles with longer mileage, the replacement cycle is shorter. Since driving conditions vary for each vehicle, the replacement should be based on actual usage. Check the antifreeze's condition—if it is insufficient, replenish it promptly. If suspended particles, sediment, or signs of deterioration or discoloration are found, replace the antifreeze and clean the system immediately. Antifreeze composition: The main components of antifreeze are: 50% purified water, 40% methanol, and 10% other substances. Types of antifreeze: Antifreeze is generally categorized into three types: ethanol-water, glycerol-water, and ethylene glycol-water.