Lubricating compositions

An automatic transmission fluid composition comprising:

• (a) a major amount of a base oil;
• (b) a mixture of friction modifiers comprising (i) at least one succinimide friction modifier selected from the group consisting of:
• (1) a succinimide of formula (I):
• wherein R is saturated or unsaturated, substituted or unsubstituted, and is selected from the group consisting of linear, branched, and cyclic radicals comprising from about 5 to about 30 carbon atoms and R′ is selected from the group consisting of hydrogen;
• alkyl, alkenyl, and aryl groups having from about 1 to 30 carbon atoms;
• and
• (2) a bis-succinimide of formula (II):
• wherein R1 is a C6 to C30 isomerized alkenyl group, represented by:
• wherein x and y are independent integers whose sum is from 1 to 30, or its fully saturated alkyl analog,
• wherein R is independently selected from the group consisting of hydrogen, C1 to C25 straight or branched chain alkyl radicals, C1 to C12 alkoxy radicals, and C2 to C6 alkylene radicals,
• wherein a is an integer from 1 to 6, and
• wherein b is zero or an integer from 1 to 10;
• and
• (ii) an imidazoline friction modifier of formula (III), (IV), or a mixture thereof:
• wherein R1 comprises a C3 to C30 straight chain or branched alkyl, alkenyl, aryl, or hydrocarbyl groups as oligomers/polymers derived from propylene isobutylene and higher olefins having terminal, internal, and vinylidene double bonds, and their heteroatom derivatives and wherein n ranges from 0 to 5;
• and optionally (3) an amine or an amide friction modifier;
• and
• (c) one or more oil-soluble ashless succinimide dispersants, phosphorylated forms thereof, boronated forms thereof, and phosphorylated and boronated forms thereof;
• wherein the total nitrogen content in an automatic transmission fluid provided by the mixture of friction modifiers is greater than or equal to about 300 ppm and the total nitrogen content provided by the one or more ashless succinimide dispersants is greater than or equal to about 500 ppm and
• wherein the automatic transmission fluid has a kinematic viscosity at 100° C. of from about 4 cSt to about 6.5 cSt and a Brookfield viscosity at −40° C. of from about 4,000 cP to about 20,000 cP.

A method for improving the friction durability for an automatic transmission apparatus by using an effective amount of a power transmitting fluid comprising:

• (a) a major amount of a base oil;
• (b) a mixture of friction modifiers, wherein the total nitrogen content provided by the mixture of friction modifiers is greater than or equal to about 300 ppm and wherein the mixture of friction modifiers comprises
• (i) at least one succinimide friction modifier of formula (I):
• wherein R is saturated or unsaturated, substituted or unsubstituted, and is selected from the group consisting of linear, branched, and cyclic radicals comprising from about 5 to about 30 carbon atoms and R′ is selected from the group consisting of hydrogen;
• alkyl, alkenyl, and aryl groups having from about 1 to 30 carbon atoms;
• and
• (ii) at least one imidazoline friction modifier of formula (III), (IV), or a mixture thereof:
• wherein R1 comprises a C3 to C30 straight chain or branched alkyl, alkenyl, aryl, or hydrocarbyl groups as oligomers/polymers derived from propylene isobutylene and higher olefins having terminal, internal, and vinylidene double bonds, and their heteroatom derivatives and wherein n ranges from 0 to 5;
• and
• (c) one or more ashless succinimide dispersants, phosphorylated forms thereof, boronated forms thereof, and phosphorylated and boronated forms thereof, wherein the total nitrogen content provided by the one or more ashless succinimide dispersants is greater than or equal to about 500 ppm;
• wherein the power transmitting fluid has a kinematic viscosity at 100° C. of from about 4 cSt to about 6.5 cSt and a Brookfield viscosity at −40° C. of from about 4,000 cP to about 20,000 cP.

An automatic transmission fluid top treat comprising:

• (a) a mixture of friction modifiers, wherein the total nitrogen content provided by the mixture of friction modifiers is greater than or equal to about 300 ppm and
• wherein the mixture of friction modifiers comprises (i) at least one succinimide friction modifier of formula (I):
• wherein R is saturated or unsaturated, substituted or unsubstituted, and is selected from the group consisting of linear, branched, and cyclic radicals comprising from about 5 to about 30 carbon atoms and R′ is selected from the group consisting of hydrogen;
• alkyl, alkenyl, and aryl groups having from about 1 to 30 carbon atoms;
• and (ii) at least one imidazoline friction modifier of formula (III), (IV), or a mixture thereof:
• wherein R1 comprises a C3 to C30 straight chain or branched alkyl, alkenyl, aryl, or hydrocarbyl groups as oligomers/polymers derived from propylene isobutylene and higher olefins having terminal, internal, and vinylidene double bonds, and their heteroatom derivatives and wherein n ranges from 0 to 5;
• and
• (b) one or more ashless succinimide dispersants, phosphorylated forms thereof, boronated forms thereof, and phosphorylated and boronated forms thereof, wherein the total nitrogen content provided by the one or more ashless dispersants is greater than or equal to about 500 ppm.