Simply stated, viscosity is defined as the internal resistance of a fluid to flow. That doesn't sound too difficult, does it?
Unfortunately, new temperature, speed and pressure demands on lubricating fluids have changed over the years, resulting in several different measurements and classifications being created to describe lubricant viscosity.
Some examples are SUS, cSt, cP, ISO, SAE engine, SAE gear and AGMA; it's enough to make a person's head start to spin. This paper will summarize some of the more commonly used viscosity standards, describe the tests used to measure viscosity, and eliminate some of the confusion all of these standards may create for the end user.
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