The viscosity index was developed for this purpose (ASTM D2270) by E. Most importantly, for any candidate oil, you need to know how viscosity changes relative to a change in temperature. Remember, the ISO Viscosity Grade system only reports viscosity at a single temperature: 40 degrees C. That said, because machines require a certain viscosity, and temperature is known to have a dramatic influence on viscosity, it is imperative that you take the average operating temperature and temperature range into account when selecting viscosity. You may recall that the well-known Stribeck curve doesn’t have a temperature variable. Instead, a machine’s viscosity requirement is based on such things as component design (e.g., bearing), loads and speeds. Minimum, maximum and optimum viscosity requirements demanded by machines don’t take temperature into account. Conversely, machines don’t care about temperature as it relates to viscosity (loosely speaking). However, a lubricant’s viscosity is meaningless unless the temperature is noted, i.e., the temperature at which viscosity is measured.
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