D5133

D5133-99
Standard Test Method for Low Temperature, Low Shear Rate, Viscosity/Temperature Dependence of Lubricating Oils Using a Temperature-Scanning Technique

1.1 This test method determines the temperature at which an oil can become unsuitable for lubrication of a mechanical device such as an engine, because of insufficient flow of the bulk oil in the sump to the oil screen. The rate of lubricant flow in the engine sump is relatively slow and the viscometric technique applied by this technique is maintained at a similarly low shear rate, 1.7 s -1 and shear stresses up to 70 Pa. Two other pumpability Test Methods, D-3829 and D4-684, generate shear rates ranging up to 100 s -1 at 525 Pa. This difference in test parameters (shear stress and shear rate) can lead to differences in measured viscosity among these test methods with some test oils.

1.1.1 This test method was evaluated over the temperature range of -10 to -35°C.

1.2 Applicability to petroleum products other than engine oils has not been determined in preparing this test method.

1.3 This test method uses the centipoise as the unit of viscosity rather than the SI unit, millipascal second. Numerically the two units are identical. All other terms in this test method are in SI units.

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