The temperature dependence of kinematic viscosity for the Estonian kukersite shale oil distillates is described by a fundamental,formula known for hydrocarbon blends. A viscosity matrix: for distillates has been compiled. The matrix includes the whole kinematic: viscosity area, which is practically possible for shale oil distillates. By using the viscosity characterization constants, A and B, it is possible to predict the viscosity of,the distillates in a wide temperature range. A program for personal computers has been developed to evaluate the viscosity of shale oil distillate blends. Compatibility of shale oil distillates amongst themselves, with gas oil type hydrocarbon fuels and with heavy petroleum residues has been described.