"Engine Oil Viscometry and Viscometers - Fact and Fallacy"
Presented at STLE Annual Meeting, Detroit, Michigan - 2013
Written by T.W. Selby, Savant Group - STLE Annual Meeting, Detroit, Michigan, May 7, 2013.
Abstract: Viscosity has always been a critical property of lubricants. It is the source of the hydrodynamic lubrication that separates lubricated surfaces moving past one another under pressure and thus is a major factor in reducing wear. On the other hand, viscosity is also a form of friction -- viscous friction -- and, as it absorbs energy, viscosity reduces the efficiency of the engine even as it protects it.