A study of the oxygen absorption characteristics and the nature of the products obtained from oils oxidizing under controlled conditions has permitted the evaluation of a number of factors involved in lubricating oil deterioration.Investigation of selected fractions of a distillate stock has shown considerable variations in reactivity toward oxygen.The rate of oxygen absorption approximately doubles for each 100 C. temperature increase over the interval 140°to 180°C ., provided it is not limited by physical factors. The presence or absence of water vapor in the oxidizing atmosphere has little effect on the oxidation of one type of oil.The oxidation of certain oils can be reduced greatly by adding natural or synthetic inhibitors.

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