FIELD: hydraulic liquids. SUBSTANCE: invention, in particular, relates to hydraulic systems provided with electrohydraulic valves and fine filters. Oil contains, wt %: zinc dialkyldithiophosphate 0.85-1.05, polymethacrylate 0.3-0.6, polymethylsiloxane 0.003-0.005, dibutyl- p-cresol 0.4-0.6, calcium sulfonate 0.02-0.1, calcium alkylsalicylate or calcium or barium alkylphenolate 0.02-0.1, nitrogen containing ethylene oxide-propylene oxide block copolymer 0.03-0.05, mineral oil - the balance. Preferable composition contains calcium sulfonate and calcium alkylsalicylate or calcium or barium alkylphenolate at ratio 1:(1-2). EFFECT: improved filterability and thermal stability of oil under elevated loads and watering. 2 cl, 2 tbl
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