Controlling chilling tower profile for dilution chilling dewaxing of 600N waxy oil

A method for solvent dewaxing waxy hydrocarbon oils comprising dilution chilling the waxy hydrocarbon oil stock in a staged chilling zone wherein cold dewaxing solvent is injected into said zone at a plurality of the stages therealong and wherein the cold dewaxing solvent and the waxy hydrocarbon oil are substantially instantaneously mixed in each stage as the waxy oil-solvent mixture passes from stage to stage, wherein the temperature profile along said zone is adjusted such that when the waxy hydrocarbon oil is a 600N waxy oil having a final boiling point of >600.degree. C. and a mean boiling point of about 490.degree.-510.degree. C. the profile is an equal chilling rate/stage profile in the staged chilling zone and when the waxy hydrocarbon oil is a 600N waxy oil having a final boiling point of <600.degree. C. and a mean boiling point of about 490.degree.-510.degree. C. the profile is an equal temperature drop/stage profile in the staged chilling zone.