Simha's statistical thermodynamics theory, based on the cell/hole model, provides an excellent description of liquid properties in the full range of reduced variables P, Ṽ, and T. In addition, it provides the occupied site fraction y as a function of these reduced variables. Recently, the theory was rigorously extended to homogeneous liquid mixtures. During the last few years, an attempt was made to correlate the zero‐shear viscosity η with Y≡1/(1−y). The Y as a function of temperature T and pressure P was computed from Simha's theory for n‐paraffins (C5 to C18), oligomers (polybutene‐1 and silicone oils), and polymers (poly(dimethyl siloxane), polystyrene, poly(methyl methacrylate), polyethylenes, polypropylene, etc.). It was found that the temperature‐ and pressure‐dependent zero‐shear viscosity η of these liquids is a function of Y(T,P). In the present work the method is being extended to mixtures of n‐paraffins.