You can buy Hammond oil ("factory specification oil") from several
suppliers, among them Goff Professional.  They have other many
other parts available as well.  Goff Professional, 175H Costello
Road, Newington, CT, 06111,  http://www.goffprof.com/shopping.jsp

I bought oil from them, available in 4 oz and 8 oz tubes, and also
the capacitor kit to replace the filter capacitors on the tone
generator of my BA Hammond.

Dick Hack - Hack Mechanical Music