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ASTM D4684-99e1
Standard Test Method for Determination of Yield Stress and Apparent Viscosity of Engine Oils at Low Temperaturestandard by ASTM International, 04/04/2000
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 exceeding 45 h to a final test temperature between -15 and -35
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