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Professional societies classify oils by
viscosity ranges or grades. The most common systems are
those of the SAE (Society of Automotive Engineers), the AGMA
(American Gear Manufacturers Association), the ISO
(International Standards Organization), and the ASTM
(American Society for Testing and Materials). Other systems
are used in special circumstances.
The variety of grading systems used in the
lubrication industry can be confusing. A specification
giving the type of oil to be used might identify an oil in
terms of its AGMA grade, for example, but an oil producer
may give the viscosity in terms of cSt or SUS. Conversion
charts between the various grading systems are readily
available from lubricant suppliers. Conversion between cSt
and SUS viscosities at standard temperatures can also be
obtained from ASTM D 2161.
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