Distillates (petroleum), solvent- refined light naphthenic, hydrotreated; Base oil — unspecified (A complex combination of hydrocarbons obtained by treating a petroleum fraction with hydrogen in the presence of a catalyst and removing the aromatic hydrocarbons by solvent extraction. It consists predominantly of naphthenic hydrocarbons having carbon numbers predominantly in the range of C 15 through C 30 and produces a finished oil with a viscosity of between 13-15 10^-6 m^2.s^-1 at 40°C.)