Manufacture of refrigeration oils

A method for the production of refrigeration oil having low pour point and low Freon Haze and Freon Flock properties which comprises contacting a low pour point lubricating oil feed stock distillate from a naphthenic base crude oil with a selective solvent for aromatics in an extraction zone forming a solvent-rich primary extract phase containing the more aromatic and naphthenic components of said lubricating oil feedstock together with a major portion of said solvent and a solvent-poor primary raffinate mixture comprising paraffinic components of said feedstock together with a minor portion of said solvent, withdrawing said solvent rich primary extract phase from said extraction step, cooling said primary extract phase to a temperature within the range of 5.degree. C. to 50.degree. C. below the temperature in said solvent extraction zone whereby two separate liquid phases are produced comprising an aromatics-rich secondary extract phase and an aromatics-lean secondary raffinate phase substantially free from waxy components of said feedstock, recovering said aromatics lean secondary raffinate, separating solvent from said secondary raffinate, and treating solvent-free secondary raffinate with sulfuric acid of 95 to 99 weight percent strength in an amount within the range of 5 to 40 pounds acid per barrel of said raffinate, and recovering unreacted secondary raffinate as a low temperature refrigeration oil have an improved pour point and improved aniline number characteristics as compared with said feedstock.