Hi Kurt, I use waste vegetable oil from 3 local restuarants, that provides me with 70 to 80 litres a week. I process a batch every two weeks. Diesel engine cars do not require any modification to run on biodiesel, in fact most engines run smoother and cleaner on it. I know of several cases of older cars which failed the NCT emmissions test on ordinary diesel, retested and passed on biodiesel.
www.imakebiodiesel.com
Mercedes 250D
Riello central heating burner
Refleks oilstove
All on B100