The increasing importance of petroleum oils for the reliable operation of machines, mechanisms and various equipment, increasing requirements for them and their further tightening makes it necessary to develop and introduce new technologies that allow obtaining high-quality petroleum oils, prolong their service life by regeneration, and introduce cleaning methods into technological processes (additional treatment), in particular with the use of local natural mineral sorbents of new deposits such as the Navbakhor deposit of bentonite clays. For the industrial development of a new deposit, the reserves of which are large, it is necessary to comprehensively study it using a complex of physicochemical research methods.