A functionalized polymer for use in a lubricant composition. The functionalized polymer includes a reaction product of a hydrocarbon polymer grafted with an acylating agent that is reacted with both: i) a hydrocarbyl substituted poly(oxyalkylene) amine and/or a poly(oxyalkylene) alcohol and ii) a polyamine. Also disclosed are a lubricating composition containing the functionalized polymer and a method of lubricating and operating an engine employing the lubricating composition that contains the functionalized polymer. The functionalized polymers may be used as viscosity modifiers and/or to provide lubricating oils have a set of properties that lead to a higher predicted fuel economy.
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