As a measure of the viscosity starts at 40 degrees Celsius temperature until 100° c. Then compare the value as a number, or a number of different machines and oil reference standards of ASTM D455.
Viscosity is a measure starting at 40 ° C to 100 ° C and then compare the numbers or the number of available oil. And according to the standards of ASTM D455.
It is a measure of initial viscosity 40 C until the temperature 100 degrees Celsius. Then compared the numbers or the number of various oil and reference standard of ASTM D455.