The synthetic lubricating oil produced from whale oil was tested in the course of the endurance test of an aeroplane gasoline engine of1, 000HP.After the run of about200hours the close inspection of the parts detached from the engine showed them to be satisfactorily clean, and the consumption of the lubricating oil was very low, about1g/FP.hr., indicating fair oxidation stability.At the final step in this test, a continuous run of about55hours without any intermediate charge of oil was carried out, and the oil samples at the specified times were drained from the crankcase.For various constants of these samples and new oil, smooth curves Were obtained by plotting them against HP.×hours.The above samples were divided into the oils of two serie, one which was made free of deterioration products by clay treatment and the other seperated from dilution matters, and their properties were investigated, respectively.From these results, the deterioration process of lubricating oil in engine and the several effects of dilution matters and deterioration products were discussed in detail.The variation of the properities of deterioration products with time were estimated according to the quantitative data of their products.It was found by means of the British Air Ministry oxidation test that the oxidation stability of the reclaimed oil obtained by clay treatment was comparable to that of new oil.From the results of the oxidation test relating to the waste oil which was drained from the other engine, a few considerations on the cause and improvement of poor stability of the waste oil were attempted.
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