The viscosities and densities of eight l-alkanol binary systems : l-propanol-l-butanol, l-propanol-l-pentanol, l-butanol-l-pentanol, 1-butanol-1-nonanol, l-butanol-l-decanol, I-pentanol-l-octanol, 1-heptanol-1-octanol, and 1-decanol-1-undecanol, were measured over the entire composition range at 308.15 and 313.15 K and at atmospheric pressure. The viscosity data were correlated by the McAllister equation resulting in an average absolute error (AAD) 0.2% when the three-body model is used and 0.14% when the four-body model is employed. The viscosity data were also used to test the predictive capability of the Generalized Corresponding State Principle (GCSP) method. The resulting AAD was 0.96%.