Fused-ring polycyclic amine functionalized olefinic polymers for lubricating oil compositions

A functionalized olefinic polymer comprising an olefinic polymer bound to at least one fused-ring polycyclic amine, wherein the fused-ring polycyclic amine comprises at least one secondary amine and at least one other heteroatom therein and further comprises at least one primary amine directly pendant to an aromatic carbon of the fused-ring polycyclic amine, wherein the at least one fused-ring polycyclic amine is bound to the olefinic polymer through the at least the one primary amine, and wherein the fused-ring polycyclic amine is a tricyclic aromatic amine comprising two aromatic rings bridged by a nitrogen atom as a first bridge, and a second bridge comprising a heteroatom radical selected from the group consisting of —O—, —NH—, —Se—, —SO—, and —SO2—.