Regarding identifying the liquid:
Based on a search for the MSDS, the MSDS (ref: http://www.mobilefun.co.uk/blog/wp-conte... ) calls it "Artware Oil C-300", with a viscosity of 3.6 mPa.s (aka 3.6 cSt).
Mineral oil comes in MANY viscosities, the closest I could find would be Peneteck, the second closest would be 4463 oil (ref http://www.hollandchemicals.com/Document... ).
Can't find a seller for "Artware Oil C-300", "Peneteck", or "4463 oil" yet. I expect there would be other mineral oils in this viscosity range as well. I haven't found a source for oil yet, but hope this helps in the search.
Will update / add comment if I find a mineral oil in this range.