The separation and recovery of fatty acid alkyl esters (FAAE) is of great significance for various industries. Crystallization is a well-suited separation process for fatty acid mixtures which may be evolved by the understanding of solid-liquid equilibrium (SLE). The SLE and kinematic viscosity (ν) at (T=298.15-318.15 K) and (P=0.1mPa) for binary mixture of FAAE: methyl decanoate (1)+ethyl decanoate or methyl dodecanoate or methyl tetradecanoate (2) has been studied. The deviation in kinematic viscosity (Δν) data was derived using experimental ν data. The measured SLE exhibit general single eutectic point like other organic mixtures. The SLE data fit well with universal quasi-chemical (UNIQUAC) equation. The ν values were interrelated using different equations recommended by Heric-Brewer, Krishnan-Ladda, and Lulian et al. Theoretically estimated values using these empirical equations are in accordance with the experimental values with percentage standard deviation less than 0.35. The ν were also analyzed by means of the McAllister equation. The Δν data were also fitted with the Redlich-Kister polynomial equation. All three binary mixtures showed negative Δν values.