Densities q, ultrasonic speeds u and dynamic viscosities g, of mixtures of morama, Tylosema esculentum, seed oil with n-hexane, n-heptane, n-octane and n-nonane were determined over the entire composition range at 298.15 K and atmospheric pressure. Excess molar volumes, V E m , excess molar free volumes V E f , deviations in isentropic compressibility, Dj s , deviations in ultrasonic speed, Du, deviations in viscosity, Dg, and the excess free energy of activation of viscous flow, DG* E , were calculated therefrom and correlated by the Redlich-Kister equation for each of the [morama seed oil ? (n-hexane or n-heptane or n-octane or n-nonane)] mixtures. The results have been discussed in terms of possible intermolecular interactions and structural effects.