Dispersant Viscosity Modifiers with Amine Functionality

A lubricating composition includes an oil of lubricating viscosity and an oil - soluble dispersant viscosity modifier . The dispersant viscosity modifier includes an olefin - based polymer backbone and at least one pendent group derived from a functionalized aliphatic amine . Each pendent group is independently attached to the olefin - based polymer back bone . The pendent group is non - ionic , non - basic , and non acidic and includes a functional group which includes at least one heteroatom other than nitrogen .