What is the oil viscosity?

Question

Accepted Answer

Oil viscosity refers to the thickness or resistance to flow of an oil.

Viscosity is measured in units of centistokes (cSt) or Saybolt Universal Seconds (SUS).
Higher viscosity oils are thicker and flow more slowly, while lower viscosity oils are thinner and flow more easily.
Viscosity is influenced by factors such as temperature, pressure, and the type of oil.
Different applications require different viscosity levels, such as engine oils, hydraulic fluids, or gear oils.
For example, a high-performance engine oil may have a viscosity of 5W-40, indicating its ability to flow well at low temperatures (5W) and maintain stability at high temperatures (40).

Accepted Answer

Viscosity is the rate of change of displacement with respect to the time.