Why is it necessary to periodically replace the engine lubricating oil?

Question

DentroTest · Accepted Answer

The main functions of oil are to lubricate moving parts to prevent friction, cool the engine, and protect it against corrosion. With use and temperature changes, the oil degrades, loses its protective properties, and becomes filled with impurities (metal particles and dirt). Therefore, changing it periodically keeps the engine in good condition and prevents serious breakdowns like engine seizure. Regarding the other options: Losing volume: If the level drops, it should be topped up, but a full change is done due to loss of quality, not quantity. Viscosity: Oil can become thinner or form sludge, but the reason for the change is the general loss of its capabilities, not simply a change in viscosity.

Why is it necessary to periodically replace the engine lubricating oil?

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