The present invention relates to dewaxing aids comprising the mixture of two or more polyalkyl(meth)acrylates having an exothermic heat initiation temperature within the specific range when chilled at 30.degree. C./minute rate, to be added together with the wax-containing hydrocarbon oil to the dewaxing solvent.The dewaxing aid according to the present invention can be used in the solvent dewaxing method containing the stage in which the chilling rate during the chilling is 30.degree. C./minute or higher, is effective for heavy type wax-containing hydrocarbon oils, and is chlorine-free.