gkamysz,
I have noted an increase in viscosity after doing the vegi oil boiling , and also noted the amount of sediment is less than the amount of glycerine that was added so my assumption is the glycerine has combined with the oil- dont forget the glycerine molecule is a natural part of vegi oils, the amount and type of bond determines the oils level of unsaturated,monosaturated or saturated fats in the oil.

I have bioled up a small batch of "OLIVE" oil last night, I used different amounts of additives than have been listed in the process, will mix some fuel and test this afternoon. This Olive oil has higher viscosity than the cheap mixed vegi oil that I used befor so should be more like castor.
Stewart