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Is it necessary to change engine oil every year?

1 Answers

VonKeegan

07/30/25 6:19am

Engine oil does not necessarily need to be changed if it has been over a year, and you can still drive temporarily. However, it is important to promptly visit a qualified maintenance facility to replace the engine oil and oil filter to prevent the degradation of its lubrication, cooling, sealing, and cleaning functions, which could cause engine damage. Below is a detailed introduction to the functions of engine oil: 1. Lubrication: Dry friction between metal surfaces can cause scratches, so the lubricating effect of engine oil is needed for protection. With the lubrication of engine oil, metal parts do not directly contact each other but float on the oil film. This is often referred to as the "oil film bearing" effect. 2. Cleaning: After prolonged engine operation, metal burrs may inevitably fall off due to friction. These burrs could potentially damage other metal surfaces. Therefore, engine oil's flushing action is essential to "carry away" these metal burrs. 3. Cooling: The engine operates at high temperatures internally, and while the cylinders rely on the cooling system, certain internal components cannot be cooled by it and instead depend on the circulation of engine oil to dissipate heat. 4. Rust prevention: Additionally, engine oil isolates metal surfaces from air, ensuring that internal engine metals do not oxidize or rust.

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What does it mean when the Toyota 4LO fault light flashes?

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