For what it's worth, this is what I posted a while ago.
My mate bought a brand new Peugeot HDI diesel about six months ago.
Yes I know that this was petrol rather than cooking oil, but it's my
guess that the same thing would happen, as the engine will run quite
well on the cooking oil, it's only the emmision control eleky bits that
dont like it.
Being used to petrol he was carefull for about a month, then got slack,
he put £20 worth of petrol in the near empty tank, after realising
what he had done, he filled to the brim with diesel.
Driving home he made it about 6 miles, this probabally being the filter
full and the lines, then the car just stoped! no noises or stutters, he
says it was just as if the ignition was turned off. He tried to start
it but no go.
Then came my phone call, I went out and pulled him home.
We drained out the tank, lines and the filter bowl, Re filled with with
fresh deisel and it started first turn of the key, not what I was
Using this car as a taxi, he has now done about 20'000 trouble free
miles in it.
So it wont allways balls the engine up.
My only thoughts are that the electric probes and magical bits envolved
with the modern common rail engines, picked up the wrong signals from
the exhaust and shut the engine down.