Distillates (petroleum), acid-treated light paraffinic; Unrefined or mildly refined base oil (A complex combination of hydrocarbons obtained as a raffinate from a sulfuric acid treating process. It consists predominantly of saturated hydrocarbons having carbon numbers predominantly in the range of C 15 through C 30 and produces a finished oil having a viscosity of less than 19 10 -6m 2 .s -1 at 40 °C.)