The optimum mode of the process of chloroxypropylation of naphthenic alcohols has been selected. The structure and composition of the synthesized oligomers with different average degrees of chloroxypropylation and products of their modification using H3PO4 have been established via GLC and (HNMR)-H-1 and IR spectroscopy. The synthesized compounds have been tested as surfactants. The physicochemical parameters have been determined, and the surface activity has been studied. The ability of these products to reduce gasoline evaporative losses during storage has been revealed.