Following are the functions of the side entering type agitator: (1) Achieve a tank-cleaning effect without manual operation by preventing piling-up of the sediment so as to increase the effective capacity of the storage tank; (2) Keep the mixed oil from demixing and stay homogenized; (3) Mix two or more components together so as to get qualified blending products within the required period of time; (4) Intensify the heat exchange in the storage tank to keep a uniform temperature of the medium