Grease composition for constant-velocity joints

A grease composition for constant-velocity joints which is prepared by blending a lube base oil with (A) a urea-urethane thickening agent comprising a mixture of

• (a) 20 to 95 mole % of a diurea compound represented by the following formula (1):
• ##STR20## (b) 4 to 50 mole % of a urea-urethane compound represented by the following formula (2):
• ##STR21## and (c) 1 to 50 mole % of a diurethane compound represented by the following formula (3):
• ##STR22## with each mole percentage being based on the total amount of the components (a) to (c), wherein in the formulae (1) to (3), R.sup.1, R.sup.4 and R.sup.7 are each independently a divalent aromatic hydrocarbon group having 6 to 15 carbon atoms;
• and R.sup.2, R.sup.3, R.sup.5, R.sup.6, R.sup.8 and R.sup.9 are each independently cyclohexyl group, a cyclohexyl derivative group having 7 to 12 carbon atoms, or an alkyl or alkenyl group having 8 to 20 carbon atoms, and wherein in said mixture a ratio of the number of amino groups (i.e., the total number of R.sup.2 --NH--, R.sup.3 --NH-- and R.sup.5 --NH-- groups) to the number of alkoxy groups (i.e., the total number of R.sup.6 --O--, R.sup.8 --O-- and R.sup.9 --O-- groups) lies between 40:60 and 95:5,
• (B) at least one compound selected from the group consisting of oxidized paraffins, diphenyl hydrogenphosphite and hexamethylphosphoric triamide, and
• (C) at least one organomolybdenum compound selected from the group consisting of molybdenum dithiophosphate and molybdenum dithiocarbamate.