Why Do Cars Need Oil Changes?

1 Answers
DiDominic
07/30/25 7:55am
Car engines require oil changes because over time, the oil can evaporate and deteriorate, losing its original properties. Engine oil, also known as motor oil or engine lubricant, is a substance enhanced with additives in a base oil, primarily containing anti-wear additives, detergents, dispersants, and multi-grade viscosity index improvers. The main functions of engine oil are to reduce friction and wear on moving parts, clean sludge (one function of dispersants) and varnish (detergents) from the engine, neutralize acids produced by fuel combustion and lubricant oxidation (detergents), improve piston ring sealing, and cool the engine by carrying away heat from moving components.
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