Viscosity of Drive-Line Lubricants by a Special Mini-Rotary Viscometer Technique

Wallis A. Lloyd; Joseph M. Perez; Derek Pruden; Kenneth O. Henderson; David L. Alexander

doi:10.4271/1999-01-3672

1999-10-25

Viscosity of Drive-Line Lubricants by a Special Mini-Rotary Viscometer Technique 1999-01-3672

Current specifications for automatic-transmission fluids and gear oils have viscosity limits which are determined by ASTM D 2983. However, that test is plagued by poor precision. This paper describes the development of a method using the Mini-Rotary Viscometer to make the determination of apparent viscosity at the same nominal shear stress as ASTM D 2983.

In this test procedure, samples are cooled in a manner similar to that described in ASTM D 2983. Experimental data were obtained on a mixture of 17 automatic-transmission and gear-oil fluids that included a number of different formulation strategies and commercial products. The results of this method yield a nearly one to one correlation with the results determined by ASTM D 2983.

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Viscosity of Drive-Line Lubricants by a Special Mini-Rotary Viscometer Technique 1999-01-3672

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