[Jesse Antarctica]

not actually true. you cant just substitue one for the other that simply.

Indeed, you need to change a little bit the motors to accomodate the fact that this oil as a lower calorific ratio than petrol; thus in fact thoses buses are not running with a 100% colza oil but more a mix of colza oil and standard petrol. This is interesting because it is less polluting got lower petrol consumption as well as having a lower cost (included all).

But you can virtually make motors running with everything that is a little bit greasy (soap and so on).