Viscosity eta and density rho of binary mixtures of coconut + colza and coconut + soybean biodiesel have been measured over the whole composition range at T = (293.15, 313.15, 333.15, 353.15, and 373.15) K and at atmospheric pressure. Densities and viscosities data were correlated with R-square adjustment and the Andrade equation, respectively, with good agreement. The deviations of viscosities (Delta eta) have been calculated from the experimental data. To predict the density and viscosity we have used Joback's method and a group contribution model proposed by Ceriani et al. (J. Chem. Eng. Data 2008, 53, 877-880), respectively.