Functionalized olefin copolymers with monoamine terminated polyether and lubricating oil compositions

An oil soluble reaction product, useful as a lubricating oil additive, comprising the product of:

• a) an oil soluble ethylene-alpha olefin copolymer comprising from 10 to less than 80 weight % ethylene and greater than 20 up to 90 weight % of at least one C3 to C28 alpha olefin, having a number average molecular weight from about 5,000 to 120,000 and grafted with 0.5 to 5 weight % of an ethylenically unsaturated acylating agent having at least one carboxylic acid group or anhydride group, with
• b) a hydrocarbyl substituted poly(oxyalkylene) monoamine of the formula:
• R1—(O—CHR2—CHR3)x-A
• wherein
• R1 is a hydrocarbyl group having from about 1 to about 35 carbon atoms;
• R2 and R3 are each independently hydrogen, methyl, or ethyl and each R2 and R3 are independently selected in each —O—CHR2—CHR3— unit;
• A is amino, —CH2amino or N-alkyl amino having about 1 to 10 carbon atoms;
• and
• x is an integer from about 2 to about 45.