Abstract

This Uganda Standard covers the measurement of the yield stress and viscosity of engine oils after cooling at controlled rates over a 43?h or 45 h to a final test temperature of 20?C or 25?C. The precision is stated for test temperatures 20?C and 25?C. The viscosity measurements are made at a shear stress of 525 Pa over a shear rate of 0.4?s_1 to 15 s_1. This test method is suitable for measurement of viscosities ranging from 4000 mPas to >400?000 mPas, and is suitable for yield stress measurements of 7 Pa to >350 Pa. This test method is applicable for used diesel oils. The applicability and precision to other used or unused engine oils or to petroleum products other than engine oils has not been determined. This standard was published on 2019-3-26