Process for obtaining aromatic oils having a polycyclic aromatic compounds content of less than 3% which are useful as rubber extenders, from the flow of mixed extract obtained in the manufacture of lubricant bases, which comprises cooling the flow of mixed extract to precipitate out non-polyaromatic components, settling to effect separation of the phases, total or partial redissolution of the light phase obtained by this settling in a solvent, cooling to separate out non- polyaromatic components and settling to recover the light phase having a low polyaromatics compounds content. <IMAGE>