Alimova Zebo Khamidullaevna and Siddikov Faxriddin 2022. THE AGING PROCESS OF MOTOR OILS DURING OPERATION. European International Journal of Multidisciplinary Research and Management Studies. 2, 06 (Jun. 2022), 166–169. DOI:https://doi.org/10.55640/eijmrms-02-06-32.