im sure this has been discussed st some point... can you run a 6.5 on ATF? i have a buddy that runs his powerstroke on straight ATF and has for 5 years now but he says you cant run a 6.5 on it because of some sort of electric eye in the pump and he says that goes for running bio as well? anyone tried this yet? im looking at picking up a '97 3500 van with a 6.5 and im wanting to try and save a few bucks on my mileage as i drive 150 miles each day to my shop.