No chance.

The JTD is a commonrail engine, so you'll just f.ck up very expensive to
replace bits of fuel system.

don't put it in the drains, it is not good stuff for a water sewage system,
the local council tip have disposal facilities.  Used oil needs lots of
filtering and chemical change before it can be used in suitable vehicles,
there are lots of sites that tell you how to make bio diesel and whether
your car is suitable (probably not)

There's a place near us that does biodiesel. They filter the oil etc. The
stuff they get in is filthy, the stuff they put out is like a halfway house
between new veg oil and diesel.

For the life of me, I still can't get the car to consistently run well on it
(Citroen ZX, Bosch pump). I think biodiesel may react with some of the
detergent agents in diesel as it can be a f.cker to start when there's a
mixture of say 80% diesel to 20% bio. If you run it on 100% biodiesel and
it's a warm day, it's fine, almost as good as being on diesel. On a colder
day it sounds like a shite taxi engine. I may just need to clean the fuel
pick up and swap the fuel filter, *but* I can't be arsed for  £5 a tank in
saving (means lifting the back seats) and no guarantee that it'll run any
better.