Viscosities eta of dilute solutions of n-propylamine, n-butylamine, di-n-propylamine, di-n-butylamine, triethylamine, tri-n-propylamine, and tri-n-butylamine in 1,4-dioxane and oxolane (tetrahydrofuran) have been measured at 303.15 K. The specific viscosities (eta -eta(0)(S))/eta(0)(S) and viscosity deviations Delta eta have been calculated. The values of (eta - eta(0)(S))/eta(0)(S) and Delta eta for alkylamine solutions are negative in dioxane while positive in oxolane, and their magnitude increases with the increase in concentration of alkylamine. The values of excess Gibbs energy of activation Delta G(*E) of viscous flow, based on Eyring's theory of absolute reaction rates, are negative for alkylamine solutions in 1,4-dioxane, while positive for alkylamine solutions in oxolane solutions. The results have been analyzed in terms of Herskovits and Kelly equation and Nakagawa equation. The values of viscosity increment nu in Herskovits and Kelly equation and the coefficient B-int' in Nakagawa equation are negative for the investigated alkylamine solutions in dioxane, while opposite is the case for oxolane. (C) 2009 Elsevier B.V. All rights reserved.