[ngoma]

I ran my D24T on WVO a few years ago, back when I could obtain a reliable supply.

Car ran fine on WVO. Insulated Flat Plate Heat Exchanger, hose-on-hose heated insulated fuel line, heated dedicated WVO filter, heated (plastic outboard motor) tank in trunk.

Changeover can happen as soon as the engine is up to operating temp. Coking the rings/ring lands happens when you burn WVO at low engine temps; that is the main thing to avoid. So time-to-changeover depends more on engine temp than fuel temp. The WVO just needs to be able to flow thru the lines and filter.

Prefiltering to 5 microns should be fine; the stock fuel filter is in the neighborhood of 10 microns nominal. Just as important is to dewater the WVO in order to avoid cavitation erosion damage to the IP and injectors.

Unfortunately the WVO supply has dried up in my area, after the monopolistic General Biodiesel plant moved in and cornered the market.