Bio-diesel is diesel fuel made from vegetable oil. It can be waste vegetable oil(KFC, Burger King etc) or new vegetable oil. It has very little emissions with no carbon dioxide and no sulfur dioxide and reduces all other emissions. I have contacted Navistar direct and they first said only a mix 5% bio-diesel with 95% regular diesel was safe to use in PSD, but after more pushing they confirmed the seals & o-rings in the injectors are compatable with bio-diesel. I would really like to talk to someone who is actually using it in late PSD. There is a great site on bio-diesel it is veggievan.com

2000 F250 Crew Cab Diesel 4x4
Converted to right hand drive
for Australia