For reputable brands of antifreeze, exceeding the maximum level will not cause any issues. The excess antifreeze will expand due to heat during vehicle operation and overflow through the pressure relief valve, which is harmless aside from leaving some stains. However, it is advisable to use a syringe to remove the antifreeze that exceeds the maximum level. On the other hand, antifreeze produced by substandard manufacturers may be corrosive. Not only can it damage the cooling system, but the overflow of excess antifreeze can also harm electrical wiring and other components in the engine bay. In severe cases, it may even corrode the radiator and flow into the engine. Generally, vehicle antifreeze should be replaced every 2 years or 40,000 kilometers. This is just a reference interval. For commercial vehicles with higher mileage, the replacement interval should be shorter. Since driving conditions vary for each vehicle, the replacement should be based on actual usage. Regularly check the antifreeze level and replenish it promptly if it is low. If suspended particles, sediment, or discoloration are observed in the antifreeze, replace it immediately and clean the system. Methods to determine if antifreeze is low: Observe the antifreeze warning light on the dashboard. If it lights up, it likely indicates low antifreeze, though it could also be due to excessively high engine temperature. Check the antifreeze reservoir. If the level is below the minimum mark (MIN), do not continue driving and add antifreeze promptly. Check the water level marks on the antifreeze overflow tank. The normal antifreeze level should be between the maximum and minimum marks. To determine if antifreeze is low, check the marks. If the level is below the minimum mark, it indicates a shortage of antifreeze.
