Is It Normal for Engine Oil to Turn Black?

1 Answers
ElijahRose
07/30/25 10:22am
It is normal for engine oil to turn black. Engine oil has a cleaning function, and turning black is a normal phenomenon as it cleans dirt from inside the engine. Engine oil, also known as motor oil or engine lubricant, is a substance enhanced with additives in base oil, primarily containing anti-wear additives, detergents, dispersants, and multi-grade viscosity index improvers. Engine oil is used for lubricating internal combustion engines. The main functions of engine oil are to reduce friction and wear on moving parts, clean sludge and varnish from the engine, neutralize acids produced by fuel and lubricant oxidation, improve the sealing of piston rings, and cool the engine by carrying away heat from moving parts.
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