Abstract: The present invention relates to a lubricant for service-free cardan shafts comprising a base selected from the group consisting of a naphthenic solvent and a paraffinic solvent; a thickener selected from the group consisting of lithium salt, lithium soap, and amides of aromatic dicarboxylic acids; at least one flux oil; and an additive selected from the group consisting of molybdenum dithiocarbamate, zinc dithiocarbamate, bismuth dithiocarbamate, molybdenum dithiophosphate, zinc dithiophosphate, and bismuth dithiophosphate, in combination with thiadiazole.