Abstract
Abstract : High temperature deposit and oil degradation characteristics of a series of turbojet lubricants were statistically analyzed. Intra-laboratory tests with three oils gave relatively large standard deviation values, but at the 95% probability level showed the oils to be significantly different in demerit value. Inter-laboratory (3 facility) tests of two of these oils showed that the demerit ratings obtained fell statistically within the single laboratory range. Correlation between demerit and other degradation factors for three well replicated oils indicated that the greater the demerit value the larger were the changes in viscosity, acid number, and oil loss. Viscosity change failed to show real correlation at low demerit levels. No correlation between demerit rating and viscosity change was apparent for a series of duplicate tests: A very minor degree of correlation appeared to exist for the comparison with oil loss and acid number.
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