Friction Theory is coupled with Statistical Associating Fluid Theory, SAFT1 and PC-SAFT, to predict the viscosity of mixtures. The universal Friction Theory parameters working with SAFT1 and PC-SAFT for pure n-alkanes, which were previously found to scale linearly with molecular weight, are used without any readjustment to predict the viscosity of symmetric and asymmet-ric mixtures of n-alkanes with accuracy that is adequate for engineering purposes.