Oil viscosity is defined as

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Oil viscosity is defined as

Viscosity is a measure of an oil's resistance to flow. It describes how thick or thin the oil is: high viscosity oils are thick and flow slowly, while low viscosity oils are thin and flow readily. This property matters in lubrication because the oil must flow to reach moving parts and form a protective film, yet remain thick enough to stay in place under operating temperatures and loads. Temperature affects viscosity—oil becomes thinner when hot and thicker when cold, which is why different oil viscosities are chosen for different climates and engines. The other options don’t describe this flow resistance: color and smell tell you nothing about how easily the oil flows, and electrical conductivity is unrelated to viscosity.

Viscosity is a measure of an oil's resistance to flow. It describes how thick or thin the oil is: high viscosity oils are thick and flow slowly, while low viscosity oils are thin and flow readily. This property matters in lubrication because the oil must flow to reach moving parts and form a protective film, yet remain thick enough to stay in place under operating temperatures and loads. Temperature affects viscosity—oil becomes thinner when hot and thicker when cold, which is why different oil viscosities are chosen for different climates and engines. The other options don’t describe this flow resistance: color and smell tell you nothing about how easily the oil flows, and electrical conductivity is unrelated to viscosity.

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