A method for lubricating a driveline device comprising supplying to the driveline device a lubricating composition comprising an oil of lubricating viscosity and an antiwear package wherein the antiwear package comprises (a) a derivative of tartaric acid, wherein the derivative of tartaric acid is represented by the formula: wherein n and m both equal 2; X is an aliphatic group, said group containing 2 carbon atoms and having n+m available points of attachment; each Y is independently -O-, or >NR 1 or two Ys together representing the nitrogen of an imide structure R-N< formed between two carbonyl groups; and each R and R 1 are independently hydrogen or a hydrocarbyl group, provided that at least one R or R 1 group is a hydrocarbyl group; each R 2 is independently hydrogen, a hydrocarbyl group or an acyl group, further provided that at least one -OR 2 group is located on a carbon atom within X that is α or β to at least one of the -C -Y-R groups, and (b) a phosphorus compound, wherein the phosphorus compound is an amine salt of a phosphate hydrocarbon ester represented by the formula: wherein R 3 and R 4 are independently hydrogen or a hydrocarbon group containing 4 to 40, or 6 to 30, or 6 to 18, or 8 to 18 carbon atoms, with the proviso that at least one is a hydrocarbon group; and R 5, R 6, R 7 and R 8 are independently hydrogen or a hydrocarbyl group, with the proviso that at least one is a hydrocarbyl group; wherein the lubricating composition further comprises (c) an organo-sulphide, wherein the organo-sulphide is a polysulphide chosen from a sulphurised organic polysulphide from oils, fatty acids or ester, olefins or polyolefins; wherein (a) the derivative of tartaric acid is present at 0.05 wt% to 0.5 wt% of the lubricating composition, (b) the phosphorus compound is present at 0.1 wt% to 1 wt% of the lubricating composition, and (c) the organo-sulphide is present at 0.1 wt% to 8 wt% of the lubricating composition. (a) a derivative of tartaric acid, wherein the derivative of tartaric acid is represented by the formula: wherein n and m both equal 2; X is an aliphatic group, said group containing 2 carbon atoms and having n+m available points of attachment; each Y is independently -O-, or >NR 1 or two Ys together representing the nitrogen of an imide structure R-N< formed between two carbonyl groups; and each R and R 1 are independently hydrogen or a hydrocarbyl group, provided that at least one R or R 1 group is a hydrocarbyl group; each R 2 is independently hydrogen, a hydrocarbyl group or an acyl group, further provided that at least one -OR 2 group is located on a carbon atom within X that is α or β to at least one of the -C -Y-R groups, and n and m both equal 2; X is an aliphatic group, said group containing 2 carbon atoms and having n+m available points of attachment; each Y is independently -O-, or >NR 1 or two Ys together representing the nitrogen of an imide structure R-N< formed between two carbonyl groups; and each R and R 1 are independently hydrogen or a hydrocarbyl group, provided that at least one R or R 1 group is a hydrocarbyl group; each R 2 is independently hydrogen, a hydrocarbyl group or an acyl group, further provided that at least one -OR 2 group is located on a carbon atom within X that is α or β to at least one of the -C -Y-R groups, and (b) a phosphorus compound, wherein the phosphorus compound is an amine salt of a phosphate hydrocarbon ester represented by the formula: wherein R 3 and R 4 are independently hydrogen or a hydrocarbon group containing 4 to 40, or 6 to 30, or 6 to 18, or 8 to 18 carbon atoms, with the proviso that at least one is a hydrocarbon group; and R 5, R 6, R 7 and R 8 are independently hydrogen or a hydrocarbyl group, with the proviso that at least one is a hydrocarbyl group; wherein the lubricating composition further comprises (c) an organo-sulphide, wherein the organo-sulphide is a polysulphide chosen from a sulphurised organic polysulphide from oils, fatty acids or ester, olefins or polyolefins; wherein (a) the derivative of tartaric acid is present at 0.05 wt% to 0.5 wt% of the lubricating composition, (b) the phosphorus compound is present at 0.1 wt% to 1 wt% of the lubricating composition, and (c) the organo-sulphide is present at 0.1 wt% to 8 wt% of the lubricating composition. wherein R 3 and R 4 are independently hydrogen or a hydrocarbon group containing 4 to 40, or 6 to 30, or 6 to 18, or 8 to 18 carbon atoms, with the proviso that at least one is a hydrocarbon group; and R 5, R 6, R 7 and R 8 are independently hydrogen or a hydrocarbyl group, with the proviso that at least one is a hydrocarbyl group; wherein the lubricating composition further comprises (c) an organo-sulphide, wherein the organo-sulphide is a polysulphide chosen from a sulphurised organic polysulphide from oils, fatty acids or ester, olefins or polyolefins; wherein (a) the derivative of tartaric acid is present at 0.05 wt% to 0.5 wt% of the lubricating composition, (b) the phosphorus compound is present at 0.1 wt% to 1 wt% of the lubricating composition, and (c) the organo-sulphide is present at 0.1 wt% to 8 wt% of the lubricating composition.