No, no, dont put that much in !
You only need a teaspoon full to make ultra low sulphur diesel the same lubricity as low suphur diesel.
I wouldnt put any more than 2 litres in per tank-I ve put a litre in per tank before.
I used to run my Tipo on 94% veg oil/3%petrol/3% diesel Redex, but that was an older, indirect injection, non common rail engine. The lift pump in the boot wont be able to handle the extra viscosity of veg if you out too much in and it ll break, then so will your common rail and your ll have a hefty bill ! Common rail engines are more complex to run on veg oil if they have a priming pump in the fuel system, although in theory, if you can get past this (by uprating the priming pump maybe) the common rail should have no trouble pumping it as the pressure is 16000bar (1600x atmospheric pressure, plus this engine is a development of the one used in the Tipo TD)...in theory.