The present invention relates to friction reducing agents for use in lubricating oil compositions comprising an amorphous polymer, such as a narrow mixture, and / or amorphous olefin copolymer of an aromatic compound, an ester, a base material of a particular group. These compositions may provide the benefits of the lubricant is mixed, instability, substantial reduction and fuel economy improvement of the coefficient of friction with no adverse effects, such as undesirable high viscosity and precipitation and the like. In one aspect of the present invention, the pentaerythritol ester and may optionally provide a friction and improved fuel economy, reduced by the addition of tri-ol ester in the lubricating oil composition. In a second aspect of the invention, the hydrocarbyl aromatic possible to obtain a similar result by adding to the lubricating oil composition containing a Group II and Group III at least one of the base material. In a third aspect, the invention relates to a lubricating oil composition comprising an amorphous olefin copolymer, and Group II and Group III at least one of the base material. In one embodiment, the third aspect may also include one or more of the aromatic hydrocarbyl and a polyol ester as part of the composition. In a fourth aspect, the hydrocarbyl aromatic suitable concentration is used in the lubricating oil composition of the paraffin base oil and poly-iso-butenyl succinic preferably comprises a mid-borate ashless dispersant.