Patent ID: 7077947

Claim:
A process for preparing a lubricating oil basestock having a VI of at least about 125 which comprises: (a) hydrotreating a lubricating oil feedstock having a wax content of at least about 50 wt. %, based on feedstock, with a hydrotreating catalyst under effective hydrotreating conditions; (b) stripping the hydrotreated feedstock to separate gaseous from liquid product; (c) contacting a dewaxing catalyst containing an alumina or alumina-containing binder with a stream containing from about 100 wppm to 10,000 wppm, measured as oxygen, of at least one oxygenate at a temperature of from 120 to 400° C. and a hydrogen pressure of from 791 to 20786 kPa to produce a selectivated dewaxing catalyst; and (d) contacting the selectivated dewaxing catalyst from step (c) with the liquid product from step (b) and dewaxing the liquid product under catalytically effective dewaxing conditions.