Any oil is better than no oil, but way specific oil works best. The most commonly recommended one is Mobil Vactra 2. However, several years ago the formula was redone with fewer tackifiers to work with synthetic flood coolant. However, this caused big issues for the printing industry, so Mobil created Vacuoline 1409 which used the exact same formula as the old Vactra 2:
http://www.practicalmachinist.com/vb/general-archive/mobile-vactra-2-a-86367-post163414/#post163414
For small, manual machines a tacky oil which stays in place is recommended, so while Vactra 2 works ok, the best option is Vacuoline 1409.
This is a place which sells 16 oz. bottles of Vacuoline 1409 online:
http://www.brwtechnologies.com/Vacuoline_1409_p/mobil_vacuoline_1409.htm
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