How to Determine Whether Car Engine Oil Needs to Be Replaced?
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Car engine oil plays a role in lubricating and reducing friction, assisting in cooling, sealing and preventing leaks, preventing rust and corrosion, and cushioning vibrations in the engine. Below are methods to determine whether the oil needs to be replaced: 1. Based on the type of oil: Engine oil degrades over time. "Ordinary" oil generally begins to oxidize after about 3 months of exposure to air, reducing its functionality. 2. Based on engine operating hours and conditions: Operating hours: If the engine remains idle after adding oil, it is equivalent to exposing the oil to air, leading to deterioration. Operating conditions: The wear on oil varies significantly between idling and running at 6000 RPM in terms of engine friction and intensity. 3. Based on engine intensity: High-performance engines are more resistant to high pressure, high temperatures, and stronger shear forces, but they also cause higher oil wear and require higher-grade oil. Compared to naturally aspirated engines, turbocharged engines are 1.3 to 1.5 times more intense, so their oil change intervals are shorter. 4. Change by date: If the mileage does not reach the specified replacement interval, the oil should still be changed based on time, as it can deteriorate. 5. Change by mileage: This can be done according to the car manufacturer's requirements (user manual). The oil should be replaced when or before the specified mileage is reached.
