Densities and viscosities of the ternary mixtures 2-methyl-1-propanol (or 2-methyl-2-propanol) + n-hexane + 1-chlorobutane have been measured at atmospheric pressure and 298.15 K. Excess molar volumes and viscosity deviations for the ternary mixtures were calculated from experimental data and fitted by the Cibulka equation. These properties have been analyzed taking into account the molecular interactions.