This is a companion post to "Antique Treadle Sewing Machine: Cleaning." I did the oiling after I cleaned a particular area, as it was easier to locate the oil places and do the job right then and there. For future reference I wanted the information in a separate post. The graphics below are taken from the White Rotary Sewing Machine manual number 11. It and a number of other old manuals can be downloaded for free from the ISMACS international website.
Basically, all moving parts must be oiled. Numerous holes allow for oiling the innards.