Nitrogen containing dispersant-viscosity improvers

A composition comprising a hydrocarbon polymer having {overscore (M)}n ranging from 20,000 to about 500,000, when the polymer is not a star polymer, and up to about GPC peak molecular weight of 4,000,000 when the polymer is a star polymer, having attached thereto pendant groups Aa and Bb wherein each A is independently selected from members of the group consisting of:

• groups of the formula
• 25
• wherein R3 is H or hydrocarbyl, R4 is a divalent hydrocarbylene group, n=0 or 1, and each of R9 and R10 is independently H, alkoxyhydrocarbyl, hydroxyhydrocarbyl, hydrocarbyl, aminohydrocarbyl, N-alkoxyalkyl- or hydroxyalkyl-substituted aminohydrocarbyl, or a group of the formula —Y—cR11—M, wherein each Y is independently a group of the formula
• 26
• each R11 is a divalent hydrocarbyl group, R12 is as defined above for R9 and R10, and M is H, hydrocarbyl, amino, —OH, an amide group, an amide-containing group, an acylamino group, an imide group, a heterocyclic group, an imide-containing group, or —SR′ wherein R′ is H or hydrocarbyl, and c is 0 or a number ranging from 1 to about 100, or one of R9 and R10 taken together with the adjacent N constitute a N—N group;
• and each B is independently selected from members of the group of formula:
• 27
• wherein each X is independently O, S, or NRb, each Rb is independently H, NH2, hydrocarbyl, hydroxy-hydrocarbyl or aminohydrocarbyl, and each Z is independently a group of the formula
• 28
• wherein each of R3, R4, and n is as defined hereinabove;
• Ra is an ethylene group, a propylene group, which groups optionally have hydrocarbyl or hydroxyhydrocarbyl substituents, or
• 29
• wherein J is H, SH, NH2, or OH, and tautomers thereof;
• the subscript a is 0 or a number ranging from 1 to about 50 and the subscript b is a number ranging from 1 to about 30.