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What does 10w40 on engine oil mean?

1 Answers

VonLily

07/30/25 1:35am

10w40 on engine oil means: 10 represents the applicable temperature of the oil at minus 25 degrees, W stands for winter, and 40 represents the high-temperature viscosity of the oil. The higher this number, the higher the viscosity of the oil at high temperatures. 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. The main functions of engine oil are to reduce friction and wear of moving parts, and to remove sludge and varnish from the engine. Engine oil also neutralizes acids from fuel and lubricant oxidation (detergents), improves the sealing of piston rings, and cools the engine by carrying away heat from moving parts.

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How to Activate the Cruise Control in the Sagitar?

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