what type of oil is normally used to lubricate the supercharger vanes?
Normally Marvel Mystery Oil is used which is readily available in the US. If you live outside the US, in Europe I know BBT in Belgium used to supply it and I think they still do. In the UK Karmann Konnection used to supply it but I have not checked with them recently.
The alternative to Marvel Oil if you still can't find it is to use Stihl Chain-saw Oil. You can find you local stockist by going to http://www.stihl.com