Hybrid electric transmission fluid

A transmission comprising:

• an electric motor;
• a lubricating fluid;
• wherein said lubricating fluid is in contact with said electric motor;
• and
• wherein said lubricating fluid comprises:
• (1) an oil of lubricating viscosity;
• and
• (2) a dispersant additive composition comprising a reaction product of (a) a hydrocarbyl substituted carboxylic acid or anhydride and (b) an amine, wherein the reaction product has a nitrogen content ranging from about 2400 up to 10,000 ppm by weight, a boron plus phosphorus to nitrogen ((B+P)/N) weight ratio of from 0:1 to about 0.8:1, wherein the dispersant additive composition in combination with a metal detergent is effective to provide an electrical conductivity to a lubricant composition of from about 300 pS/m to less than 1700 pS/m.

A lubricating composition for a hybrid vehicle comprising:

• (1) a base oil of lubricating viscosity;
• (2) a dispersant additive derived from (a) a hydrocarbyl substituted carboxylic acid or anhydride and (b) an amine, wherein the dispersant additive has a nitrogen content ranging from about 2400 up to 10,000 ppm by weight, a boron plus phosphorus to nitrogen ((B+P)/N) weight ratio of from 0:1 to about 0.8:1;
• and
• (3) a metal-containing detergent,
• wherein the dispersant additive plus metal-containing detergent is effective to provide the lubricating composition with an electrical conductivity of from about 300 pS/m to less than 1700 pS/m.