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Have an informative chat.
There is talk of the possibility of using used vegetable oil in diesel engines. And there is talk that it is possible to use clean and filtered used veg oil straight away. If it is that simple then why is it not very common or popular?
I'm not super-familiar with the process, but here's what I do know:
It works, but there are a few drawbacks to the straight-up use of vegetable in a diesel.
1 - Limited availability. Not into siphoning at McDonald's myself, and it must be filtered.
2 - Cost of the conversion kit; looks like they are going for about $1500.
3 - Reports of clogging up fuel injectors and additional parts of the fuel system as mileage accumulates.
Biodiesel is the more popular method for the use of vegetable oil. This way it's processed and mixed with petroleum diesel fuel up to about 20%, similar to widespread use of ethanol in gasoline up to 10% (E-10). But no matter what you hear, that 10% ethanol is causing corrosion in fuel systems. Not sure about the biodiesel.