Densities, viscosities, and refractive indices of the ternary system diisopropyl ether + ethanol + methylcyclohexane at T = 298.15 K and the binary systems diisopropyl ether + ethanol, diisopropyl ether + methylcyclohexane, and ethanol + methylcyclohexane were measured at T = (288.15, 298.15, and 308.15) K and atmospheric pressure over the whole composition range. Densities were determined using a vibrating-tube density meter. Viscosities were measured with an automatic Ubbelholde capillary viscometer. Refractive indices were measured using a digital Abbe-type refractometer. Excess molar volumes V-E, deviations in the viscosity &UDelta;(n), and deviations in the refractive index &UDelta; n(D) for the mixtures were derived from experimental data. The binary data of V-E, &UDelta; n, and &UDelta; n(D) were correlated as a function of the mole fraction by using the Redlich-Kister equation. For the ternary data, several polynomial equations have been tested to minimize the set of parameters for adequate correlation.