According to general car maintenance guidelines, the replacement interval for engine coolant (also known as antifreeze coolant) is usually every two years or 20,000 to 30,000 miles (about 3.).20,000 to 480,000 km) at a time.
1.Anti-corrosion and anti-rust properties: Anti-corrosion and anti-rust additives in engine coolant gradually degrade with time and use. If not replaced, the effectiveness of these additives will be diminished, leading to an increased risk of corrosion and rust of the metal parts inside the engine.
2.Cooling performance: Over time, components such as antifoam agents and antioxidants in engine coolant can also become ineffective. This can cause the coolant to become unstable and unable to dissipate heat effectively, raising the engine temperature, which can affect the performance and life of the engine.
1.Timing: Generally speaking, a replacement of engine coolant every two years is a reasonable time interval. This is because additives in engine coolant degrade over time, even when the vehicle is not in use.
2.Mileage: Mileage is also one of the most important factors affecting engine coolant change intervals. Typically, every 20,000 to 30,000 miles (about 320,000 to 480,000 km) is more suitable to replace the coolant at one time. However, some vehicles may have longer replacement intervals, so it's best to refer to the vehicle manufacturer's recommendations.
3.Coolant color and quality: Checking the color and quality of engine coolant is also an important way to determine if it needs to be replaced. If the coolant becomes cloudy, cloudy, or has suspended solids, or if the color change is noticeable, then this could be a sign of ageing and contamination of the coolant and needs to be replaced.
To sum up, according to general guidelines, it is recommended to replace the engine coolant every two years or 20,000 to 30,000 miles. However, the exact replacement interval can be affected by factors such as the vehicle model, the environment in which it is used, and the type of coolant. Regularly checking the color, clarity and quality of your coolant, and replacing it as needed, can keep your engine running properly and extend its life.