Hydrocarbons, C 17-40 , hydrotreated solvent-deasphalted distillation residue, vacuum distillation lights; Base oil — unspecified (A complex combination of hydrocarbons obtained as first runnings from the vacuum distillation of effluents from the catalytic hydrotreatment of a solvent deasphalted short residue having a viscosity of 8 10^-6 m^2.s^-1 at approximately 100°C. It consists predominantly of hydrocarbons having carbon numbers predominantly in the range of C17 through C40 and boiling in the range of approximately 300°C to 500°C.)