I have used numerous tankfuls of Biodiesel from B-5 to B-20 with absolutly no issues in my 08 6.4 Superduty, I started using it at around 10K and now over 72K miles, its a know fact that Biodiesel cleans out the residue left behind by straight diesel, the Bio websites says to carry extra fuel filters when switching over from straight diesel, after 1 or 2 filter changes all is good although I never had that issue since I started using it before the residue had a chance to build up. When given a choice between regular and Bio I will take the Bio, I would rather spend my money on something produced by an American farmer than some foreign terrorist oil country, so what if the farmer is subsidised by the gov. they subsidised everything else. JMO