Process for preparing a sulfurized molybdenum-containing composition and lubricating oil containing said composition

a process for preparing a sulfurized molybdenum-containing composition which comprises reacting ammonium tetrathiomolybdate and a basic nitrogen compound selected from the group consisting of a succinimide, carboxylic acid amide, hydrocarbyl monoamine, hydrocarbon polyamine, Mannich base, phosphonamide, thiophosphonamide, phosphoramide, or dispersant viscosity index improvers, or mixtures thereof, wherein from 0.01 to 2.00 atoms of molybdenum are present per basic nitrogen atom, in the presence of a polar promoter wherein from 0.1 to 50 mols of promoter are present per mol of molybdenum, in order to form a sulfur and molybdenum-containing composition.