One of the most promising modern lubricants is nanostructured ferrofluid, which can be used in tribounits for various purposes due to its unique physical and triboengineering properties. However, the existing ferrofluids are less effective than traditional lubricants mostly because of the friction-caused colloidal structure destruction. The article considers the possibility of increasing aggregate and sedimentation stability of the ferrofluid lubricating oil colloidal system using a selection of surfactant stabilizer by its dielectric permittivity value. The experimental results provided the colloidal stability data of ferrofluids that have different chemistry. The paper proposes the dielectric criteria, which can help select surfactant stabilizers when creating new stable magnetic liquids. It is shown that magnetic liquids stability dependence on dielectric permittivity of structural components might be explained by its influence on the sorption processes during the formation of protecting solvation shells for magnetic particles.