High viscosity lubricants result in high shear stresses. As a rule of thumb, the viscosity of a machine oil fall about 25% with every 10�C temperature increase.

The Reynolds interpolation function is accurate in the vicinity of the reference points. The Vogel equation is most accurate over the whole range.

Normally the viscosities at 40 �C y 100 �C are taken from the data sheet as reference points, but any two temperatures and viscosities can be inserted.