What is the difference between engine oil 40 and 50?

1 Answers
TaliaRose
07/30/25 6:23am
The difference between engine oil 40 and engine oil 50 is the viscosity: the viscosity of engine oil 40 is 40; the viscosity of engine oil 50 is 50. Here is some information about engine oil: 1. Engine oil, motor oil, or engine lubricant is a substance enhanced with additives in base oil, mainly containing anti-wear additives, detergents, dispersants, and multi-grade oil viscosity index improvers. 2. 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 from fuel and lubricant oxidation, improve piston ring sealing, and cool the engine by carrying away heat from moving parts.
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