In the present article results of mathematical modeling under the relative analysis of influence of external factors (parameters of a high-frequency electromagnetic field and temperature) on kinematic viscosity of rapeseed oil are shown. Proceeding from initial conditions of a liquid state and a values variation of the chosen factors in the set interval the mathematical model is compounded. On the basis of the model analysis it is positioned that prevailing influence on a kinematic viscosity renders a  high-frequency electromagnetic field voltage.