Auxiliary

What about the 2.0 tdi it also uses the pump nozzle technology

Hi everyone! Im interested in buying an a4 or a6 from roughly 2004-2009. I would like to know what diesel engine is most suitable for running on used cooking oil. I’ve heard that the older pump nozzle injection, pd engines are the best for this use. Because of its high injection pressure and use of several “injection pumps”. But I may be mistaken perhaps the common rail engines also works just fine running on used cooking oil. What engine is the best option for my unusual request? Also, what engine would need the least modifications to work properly? Pardon my English I’m Swedish.