Hi,

I use biodiesel and a 50/50 blend of wvo and kerosene ( or diesel ) in the second tank. I switch when the engine is warm. No problems after 8k miles on my '92 F-250 7.3 na w/ 176,000 miles. The truck is stock.

But the 50/50 mix is not recommended and experimental. Some other F-_50 owners have had problems on unheated blends and others when converted to a heated fuel system.

For the most stories online, go to biodiesel.infopop.cc in the SVO Forum, and search on 'F-250' or 'F-350'. There must be a couple dozen there.