Grease composition for constant velocity joints

A lubricating grease comprising:

• a. a base oil combination comprising 10% to 35% of one or more poly α-olefins, 3% to 15% of one more synthetic organic esters, 20% to 30% of one or more naphthenic oils, the remainder of the combination being one or more paraffinic oils, the percentages being by weight of the total base oil combination and the ratio of the weight of the ester(s) in the combination to the weight of the poly α-olefin(s) therein being not greater than 1:3;
• b. between 2% and 15% by weight of the total grease of a lithium soap thickener;
• c. between 1% and 5% by weight of the total grease of a molybdenum dithiophosphate of the following general formula:
• wherein X or Y represents S or O and each of R1 to R4 inclusive may be the same or different and each represents a straight chain or branched chain alkyl group having between 1 and 24 carbon atoms or an aryl group having between 6 and 30 carbon atoms;
• d. between 1% and 5% by weight of the total grease of a zinc dialkyldithiophosphate of the following general formula:
• (R5O)(R6O)SP—S—Zn—S—PS(OR7)(OR8)
• wherein each of R5 to R8 inclusive may be the same or different and each represents a primary or secondary alkyl group having 1 to 24, preferably 3 to 8 carbon atoms;
• e. between 1% and 5% by weight of the total grease of a sulphur-free friction modifier;
• and
• f. at least one normal grease additive such as an anti-oxidant, corrosion inhibitor, extreme pressure additive or tackiness agent.