LUBRICANT COMPOSITIONS

Compositions containing a) a lubricant or a hydraulic fluid and b) an effective amount of a triaryl thionophosphate mixture of the formula I in which x is 0 to 2.7, m is 3-(x+n) and n is 0 to 3-(x+m) and x+m+n is 3, R1, R2, R3, R4, R5, R6, R8 and R9, independently of one another, being, for example, H, alkyl having 1 to 18 C atoms, cycloalkyl having 5 to 12 C atoms, phenyl or phenyl-C1-C3alkyl and R4 and R7, independently of one another, being alkyl having 1 to 18 C atoms, cycloalkyl having 5 to 12 C atoms, phenyl or phenyl-C1-C3alkyl, subject to the proviso that x and n are nat 0 at the same time, that at least two of the radicals Ar1, Ar2 and Ar3 are different from one another and that dixylenyl paracresyl thionophosphate is excluded. The triaryl thionophosphate mixtures are anti-wear additives and the compositions are particularly suitable, for example, for use in internal combustion machines.