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Study of thermo-oxidative stability of liquids for step-by-step hydroshift gear and stepless gear
Oil and gas processing, chemistry of oil and gas

Authors: Maria I. YAGODA graduated from Gubkin Russian State University of Oil and Gas in 2009 and received Master’s Degree in 2011 in Engineering and Technology in the field of Chemical Engineering of Fuel and Gas. Currently she is postgraduate student of the Department of Chemistry and Engineering of Lubricants and Chemmotology specializing in chemical technology of fuels and high-energy substances. E-mail: yagodamasha@mail.ru
Leonid N. BAGDASAROV graduated from Tashkent Motor-Road Institute, speciali- zing in „Automobiles and Automobile Industry”. He is Associate Professor, Candidate of Technical Sciences. In 1988 he complete postgraduate course of studies at Gubkin Russian State University of Oil and Gas and defended his thesis „Development of Working-Conservation Oils for Worm Gears” (1991). He is author of 104 publications and holder of 14 patents. E-mail: lebage1963@mail.ru
Boris P. TONKONOGOV was born in 1951. He graduated from Gubkin Moscow Institute of Petrochemical and Gas Industry in 1973. He is Doctor of Chemical Sciences, Professor, Head of the Department Chemistry and Engineering of Lubricants and Chemmotology at Gubkin Russian State University of Oil and Gas. His research interests include obtaining of alternative motor fuels based on natural gas, production and application of lubricants and additives, including those for alternative motor fuels. He is author of over 100 scientific works, inventions, training and teaching aids. E-mail: bpt@gubkin.ru

Abstract: The Russian fleet of vehicles with automatic transmission is growing very rapidly. In this regard, the task of developing oils for automatic transmissions based on domestic raw materials is becoming very urgent. We studied the low-viscosity base oils of API Group III to determine their applicability for automatic gear to meet present-day requirements. Comparative testing of ATF (automatic transmission fluid) samples showed that oils prepared using domestic LUKOIL VHVI 4 (isomerization product of wax concentrates) as a base oil are of high quality and can be used both in hydro-mechanical transmissions requiring oils of DEXRON®-VI level and stepless transmissions. At the same time the oils show highthermo-oxidative stability, excellent low temperature pumpability and excellent viscosity-temperature properties

Index UDK: УДК 665.6

Keywords: thermal stability, fluid for stepless gearboxes (automatic transmission), continuously variable transmission (CVT), ATF, base oil of API group III, Yubase 4, LUKOIL VHVI 4

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10.Standard Test Method for Corrosiveness and Oxidation Stability of Hydraulic Oils, Aircraft Turbine Engine Lubricants, and Other Highly Refined Oils — ASTM International, 2004.
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