the disclosure relates to a lubricant composition including : an organomolybdenum compound , one or more anti - wear and extreme pressure additives chosen from thiaazoles , one or more phosphorus - containing or phosphor - sulfur - containing anti - wear and extreme pressure additives chosen from phosphites , phosphates , phosphonates , thiophosphates or thiophosphites , the lubricant composition having a weight content of molybdenum between 90 and 350 ppm . this is used for lubrication of gear boxes .