A lubricant additive composition comprising: a) at least one compound of formula or a tribologically acceptable salt thereof, wherein A is: each R 1a is the same or different and is independently selected from alkyl, alkenyl, cycloalkyl, cycloalkylalkyl, aryl, and aralkyl, wherein said aryl and aralkyl are optionally substituted with one to three substituents each independently selected from alkyl and alkenyl; each R 2a and R 3a are independently selected from H, alkyl, alkenyl, cycloalkyl and cycloalkylalkyl; Y a is selected from the group consisting of alkyl, alkoxyalkyl, benzyl, and -R 4a -R 5a -R 6a; R 4a is alkylene; R 5a is selected from the group consisting of a bond, alkylene; -C - and -C(R 7a)-; R 6a is selected from the group consisting of alkyl, hydroxyalkyl, hydroxyalkyleneoxy hydroxy and alkoxy; R 7a is hydroxy; m is an integer from 2 to 8; X 1a is R 8a or Z; X 2a is selected from the group consisting of R 8a, R 8a is alkyl, alkenyl, cycloalkyl, cycloalkylalkyl, aryl, and aralkyl, wherein said aryl and aralkyl are optionally substituted with one to three substituents each independently selected from alkyl and alkenyl; Z is wherein when X 2a is R 8a, X 1a is Z; and b) at least one compound of formula wherein each R 1b is independently alkyl or cycloalkyl; each of R 2b R 3b, R 4b and R 5b is independently selected from the group consisting of hydrogen, alkyl and cycloalkyl; each n is independently an integer from 0 to 6; M 1, M 2, X 1b, and X 2b are each independently S or O; each W is independently S or O; Y b is selected from the group consisting of alkyl, alkoxyalkylene, benzyl, and -R 6b -R 7b -R 8b; R 6b is alkylene; R 7b is selected from the group consisting of a bond, alkylene; -C - and -C(R 9)-; R 8b is selected from the group consisting of alkyl, hydroxyalkylene, hydroxyalkyleneoxy, hydroxyl and alkoxy; and R 9 is alkyl. a) at least one compound of formula or a tribologically acceptable salt thereof, wherein A is: each R 1a is the same or different and is independently selected from alkyl, alkenyl, cycloalkyl, cycloalkylalkyl, aryl, and aralkyl, wherein said aryl and aralkyl are optionally substituted with one to three substituents each independently selected from alkyl and alkenyl; each R 2a and R 3a are independently selected from H, alkyl, alkenyl, cycloalkyl and cycloalkylalkyl; Y a is selected from the group consisting of alkyl, alkoxyalkyl, benzyl, and -R 4a -R 5a -R 6a; R 4a is alkylene; R 5a is selected from the group consisting of a bond, alkylene; -C - and -C(R 7a)-; R 6a is selected from the group consisting of alkyl, hydroxyalkyl, hydroxyalkyleneoxy hydroxy and alkoxy; R 7a is hydroxy; m is an integer from 2 to 8; X 1a is R 8a or Z; X 2a is selected from the group consisting of R 8a, R 8a is alkyl, alkenyl, cycloalkyl, cycloalkylalkyl, aryl, and aralkyl, wherein said aryl and aralkyl are optionally substituted with one to three substituents each independently selected from alkyl and alkenyl; Z is wherein when X 2a is R 8a, X 1a is Z; and each R 1a is the same or different and is independently selected from alkyl, alkenyl, cycloalkyl, cycloalkylalkyl, aryl, and aralkyl, wherein said aryl and aralkyl are optionally substituted with one to three substituents each independently selected from alkyl and alkenyl; each R 2a and R 3a are independently selected from H, alkyl, alkenyl, cycloalkyl and cycloalkylalkyl; Y a is selected from the group consisting of alkyl, alkoxyalkyl, benzyl, and -R 4a -R 5a -R 6a; R 4a is alkylene; R 5a is selected from the group consisting of a bond, alkylene; -C - and -C(R 7a)-; R 6a is selected from the group consisting of alkyl, hydroxyalkyl, hydroxyalkyleneoxy hydroxy and alkoxy; R 7a is hydroxy; m is an integer from 2 to 8; X 1a is R 8a or Z; X 2a is selected from the group consisting of R 8a, R 8a is alkyl, alkenyl, cycloalkyl, cycloalkylalkyl, aryl, and aralkyl, wherein said aryl and aralkyl are optionally substituted with one to three substituents each independently selected from alkyl and alkenyl; Z is b) at least one compound of formula wherein each R 1b is independently alkyl or cycloalkyl; each of R 2b R 3b, R 4b and R 5b is independently selected from the group consisting of hydrogen, alkyl and cycloalkyl; each n is independently an integer from 0 to 6; M 1, M 2, X 1b, and X 2b are each independently S or O; each W is independently S or O; Y b is selected from the group consisting of alkyl, alkoxyalkylene, benzyl, and -R 6b -R 7b -R 8b; R 6b is alkylene; R 7b is selected from the group consisting of a bond, alkylene; -C - and -C(R 9)-; R 8b is selected from the group consisting of alkyl, hydroxyalkylene, hydroxyalkyleneoxy, hydroxyl and alkoxy; and R 9 is alkyl. each of R 2b R 3b, R 4b and R 5b is independently selected from the group consisting of hydrogen, alkyl and cycloalkyl; each n is independently an integer from 0 to 6; M 1, M 2, X 1b, and X 2b are each independently S or O; each W is independently S or O; Y b is selected from the group consisting of alkyl, alkoxyalkylene, benzyl, and -R 6b -R 7b -R 8b; R 6b is alkylene; R 7b is selected from the group consisting of a bond, alkylene; -C - and -C(R 9)-; R 8b is selected from the group consisting of alkyl, hydroxyalkylene, hydroxyalkyleneoxy, hydroxyl and alkoxy; and R 9 is alkyl.