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1.1 ,This practice2 covers the procedures for calculating the viscosity index of petroleum products, such as lubricating oils, and related materials from their kinematic viscosities at 40 ,°,C and 100 ,°,C.
Note 1: ,The results obtained from the calculation of VI from kinematic viscosities determined at 40 ,°,C and 100 ,°,C are virtually the same as those obtained from the former VI system using kinematic viscosities determined at 37.78 ,°,C and 98.89 ,°,C.