Abstract: Lube oils of increased VI are prepared by hydrotreating using bulk Ni/Mn/No or Cr/Ni/Mo sulfide catalysts prepared from ligated, e.g., ethylene diamine, metal complexes. In particular the Ni/Mn/Mo sulfide catalyst is prepared from the oxide, precursor with subsequent sulfiding while the Cr/Ni/Mo sulfide catalyst is prepared from the sulfide precursor in the presence of H.sub.2 S/H.sub.2.

Abstract: Dewaxed oils can have their low temperature performance improved by the removal of residual wax by adsorption of said residual wax onto a hydrophobic molecular sieve. The wax-laden hydrophobic molecular sieve is regenerated by use of dewaxing solvents, such as ketones.The dewaxed oils, which have residual wax removed by the present invention, are oils which have been dewaxed by means of solvent dewaxing procedures or by catalytic dewaxing processes. These oils, produced by the combination of conventional-adsorptive trim dewaxing, exhibit superior formulated oils low temperature performance as compared to formulated oils made from oils dewaxed to the same pour point solely by conventional dewaxing by either solvent or catalytic processes practiced under severe conditions (deep dewaxing).

Abstract: The oxidation stability of a refined hydrocarbon oil can be sigificantly improved by adding at least one cyclic sulfide and at least one aromatic compound to said oil.