Is it okay not to change the engine oil for a long time?

[Jeff]

It is not advisable to not change the engine oil for a long time. The reasons are as follows: 1. Reduced sealing effect. High-quality engine oil with appropriate viscosity can effectively seal the gaps between the cylinder block and pistons, preventing gas leakage. If the oil is not changed for a long time, it will become watery and lose its sealing function. 2. Reduced lubrication effect. The lubrication system is crucial to the engine, affecting its performance and service life. If the oil is not changed for a long time, its lubrication effect will significantly decrease. 3. Reduced cooling effect. The heat absorption and conduction properties of oil are much higher than those of water. If the oil deteriorates severely, its heat dissipation function will be greatly reduced. 4. Increased wear of components. If the engine oil is not changed for a long time, it will become ineffective and deteriorate. Instead of protecting the components, it will increase wear and damage. 5. Corrosion of internal components. If the oil is not changed for a long time, it will accumulate many impurities, such as iron filings, and may also cause corrosion of internal components. 6. Further damage to the engine.