ASTM D6896-20a

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Standard Test Method for Determination of Yield Stress and Apparent Viscosity of Used Engine Oils at Low Temperature
standard by ASTM International, 11/01/2020



1.1”This test method covers the measurement of the yield stress and viscosity of engine oils after cooling at controlled rates over a period of 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 mPa”s to >400”’000 mPa”s, and is suitable for yield stress measurements of 7 Pa to >350 Pa.

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