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The discovery of Constrained Geometry Catalysts (CGC) for production of polyolefins allows one to make new polyolefins in a solution process. CGCs have a single active site for polymerization, and the bridged nature of the monocyclopentadienyl titanium complex allows facile incorporation of alpha olefins into random ethylene copolymers that are characterized by narrow molecular weight distributions and narrow comonomer distributions. In this paper, olefin copolymers (OCPs) of ethylene with propylene and octene comonomers produced with constrained geometry catalyst are described, and their behavior as viscosity index improvers in oil solutions is examined. A wide range of amorphous and semicrystalline OCPs have been produced and characterized. Crystallinity was measured by DSC, and molecular weights (Mw) were determined by GPC.