Summary Densities at 298.15 K have been measured for the ternary mixture methyl tert-butyl ether (MTBE)+1-pentanol+heptane and for the involved binary mixtures. Excess molar volumes were calculated from densities. Attending to the symmetry of experimental excess molar volumes, suitable fitting equations have been used in order to correlate adequately the experimental data. Several empirical expressions for estimating ternary properties from experimental binary results.