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1.1 This test method covers the determination of the rotational viscosity and the shear thinning properties of heavy duty diesel engine drain oils at 100 °C, in the shear rate range of approximately 10 s^-1 to 300 s^-1, in the shear stress range of approximately 0.1 Pa to 10 Pa and the viscosity range of approximately 12 mPa·s to 35 mPa·s. Rotational viscosity values can be compared at a shear rate of 100 s^-1 by this test method.2^,3

1.2 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.

1.3 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

5.1 Rotational viscosity measurements allow the determination of the non-Newtonian, shear thinning property of drain oil. Rotational viscosity values can be compared at a shear rate of 100 s^-1 by this test method.2^,3