Originally Posted by TonyFromWestOz

Tenknots,
Welcome to the Vworld.
My wife does not want to need to remember switches. She has a blend of biodiesel and "cold filtered" WVO in her tank. I have fitted a coolant/fuel heat exchanger before the stock pre-filter. As a precaution, I added a cheap fuel filter ($2.00 each) immediately after the heater.
The engine starts on the cold blend and is idled for a minute only before being driven. I change the blend ratio for winter to 50% and 75% in summer.
Some tank residues have been captured by the sacrificial cheap filter and replacement fitted about 4 times in the first 3 months. I changed the filter after 10 000km as preventativre maintenance.

My wife has been using this fuel for 12 months and has covered 12000km so far with no engine problems. This does not prove that no damage will occur, but this is the start of an extended test.