We were somewhere around Barstow, on the edge of the desert, when the
drugs began to take hold. I remember Bill
saying something like:

I have a 2 cylinder Lister on a generator, what are your thoughts on
cooking oil in that? Not that I have a lot of it, but it would be good
to find a use for the old stuff.

Jeez, they'll run on anything.

How easy is it to filter down to 5 microns?

Easy in the first stages, coarse filtering can be done with cloth
doubled or tripled over; requires actually buying a filter for the final
ones. 5 micron filters aren't hard to find. At the end stages you really
need to start pumping it if you want it within a reasonable time.

Start and warm up on diesel first or is their a %mix of derv and
cooking oil that is OK?

For a stationary engine I'd start and stop on diesel, and for normal
running, 100% vegoil will be ok once the engine and fuel system are up
to temp. If this is in an unheated outbuilding or outside in the winter,
a heated fuel system is a must for the vegoil pipery.
Of course, it will run perfectly fine on a 50/50 mix in the summer,
60/40 (dino/vegoil) in the winter, but be ready for unreliable starting
in the winter.