They tell me (Ford) NOT to run any bio in mine (2005 E350) and I actually experienced a $5,000 reason not too. My fuel tank "delaminated" and the dealer attributed it to having run bio diesel in my tank...took out the tank, filters and some injectors. I don't know, I am not aware of running bio back then. When I go through Illinois I fill up in St. Louis and Do Not get any fuel in that state (everything there is bio). If I am at a function in Illinois, I get the minimum fuel that I can to get me back to non bio stations.
