In the high temperature zone, the oil burns completely or carbonaceous particles remain, which cannot remain on the surface devoid of a binding medium. The greatest danger of varnish deposition is for piston rings. By filling the gaps formed by the piston rings and the grooves drilled in the pistons, it reduces the mobility of the rings.. To reduce or prevent the formation of carbon deposits, special surfactants called detergent-dispersing additives are introduced into engine oils.

engine oils, sedimentation, additives, oxidation, varnish deposits, carbonaceous particles.

Ostrikov V.V. O. A. Kleimenov, V. M. Bautin. Lubricants and their quality control in the agro-industrial complex - M.: Rosinformatekh, 2008, 172 p.

Dzherikhov V.B. Automotive operational materials: textbook. St.Petersburg: SPGASU, 2009

Khamidullaevna, A. Z. (2022). Investigation of changes in the quality of motor oils when operating engines. Innovative Technologica: Methodical Research Journal, 3(06), 119-122.

Alimova, Z., Akhmatjanov, R., Kholikova, N., & Karimova, K. (2021). Ways to improve the anticorrosive properties of motor oils used in vehicles. In E3S Web of Conferences (Vol. 264, p. 05004). EDP Sciences.

Alimova, Z., Abdukhalilov, Н., Kholmirzayev, В., & Samatayev, Т. (2020). Ways to improve the performance of hydraulic oils for agricultural machinery. Industrial Technology and Engineering, 3(36), 17-22.

Khamidullaevna, A. Z., & Faxriddin, S. (2022). The aging process of motor oils during operation. European International Journal of Multidisciplinary Research and Management Studies, 2(06), 166-169.

Hamidullayevna, A. Z., Parpiyevna, N. G., & Kabulovna, S. D. (2022). Causes of Contamination of Lubricants Used in Diesel Engines. Texas Journal of Engineering and Technology, 13, 44-46.

Khamidullaevna, A. Z., Parpiena, N. G., & Kabulovna, S. D. (2022). Study of the Work of the Boundary Layers of Lubricants Materials. Academicia Globe: Inderscience Research, 3(12), 119-122.

Hamidullayevna, A. Z., Kabulovna, S. D., & Parpiyevna, N. G. (2022). Operability of the boundary layers of lubricants during operation.

Zebo, A., & Bakhtiyor, S. (2022). Oxidation of motor oils during operation engines in military equipment. Web of Scientist: International Scientific Research Journal, 3(8), 97-103.

Hamidullayevna, A. Z., & Ismailovich, I. K. (2023). Causes of changes in the properties of motor oils in the high temperature zone of the engine. American Journal of Applied Science and Technology, 3(01), 1-5.

Alimova, Z. (2020). Ways to improve the properties of lubricants used in vehicles. VNESHINVESTROM”,–2020.