Question 1

What do motor oil viscosity numbers mean?

Accepted Answer

10W-30: W = winter viscosity, second number = hot viscosity. Lower W flows better cold. Higher second = thicker hot.

Question 2

What is SAE viscosity grade?

Accepted Answer

Society of Automotive Engineers rating. 0W-20 to 25W-60. W grades: cold flow. Non-W: 100°C viscosity.

Question 3

What's the difference between dynamic and kinematic viscosity?

Accepted Answer

Dynamic viscosity (Pa·s, cP) measures flow resistance. Kinematic viscosity (m²/s, cSt) is dynamic viscosity divided by density, used in flow calculations.

Question 4

How does temperature affect viscosity?

Accepted Answer

Liquids generally become less viscous (thinner) when heated. Motor oil ratings (like 10W-40) indicate viscosity at cold (W) and hot operating temperatures.

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