TY CONF TI THE FREQUENCY OF ENGINE OIL REPLACEMENT, TAKING INTO ACCOUNT THE OPERATING CONDITIONS OF CARS IN MODERN CONDITIONS KW automobiles KW maintenance frequency KW engine oil KW methods for determining the frequency JO Problems of road transport operation and ways to solve them on the basis of promising technologies AU Popov, D.A. AU Kadyrmetov, A.M. AU Goryachev, N.A. AU Derevyanko, P.I. PY 2022 PB FSBE Institution of Higher Education Voronezh State University of Forestry and Technologies named after G.F. Morozov