FIELD: study of operational properties of oil products, determination of content of antioxidant additive in transformer oils and of oil change periods. SUBSTANCE: analyzed oil is oxidized in mixture with cumol in presence of initiators of asobioisobutyronitryle, graph of dependence of volume of consumed oxygen on time is plotted, period of induction τionol is found by formula 
mole/kg, where c is content of Wi mole/kg; Wi is initiation rate, 6,8•10-8 mole/l.s; P is weight of oil, kg/l and percentage content of ionol per cents by mass is determined from formula 
. EFFECT: quantitative determination of ionol in transformer oil. 1 tbl
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