I am alittle confused on all the new diesel specs. A friend of mine was looking to buy the new 08 powerstroke, ford tells him that he can't burn purple farm diesel because the there is too much sulfur in it. Ford says that it has to be ultra low sulfur diesel or else it voids warranty. Ultra low sulfur diesel is not sold at all stations, making it hard to fuel up any and everywhere. Ford is telling him that in 2010 that is the only diesel that can be sold in Canada, so what does this mean for the older model diesels? Are these older trucks going to start have engine issues from not having a diesel that doesn't lubricates pumps and injectors. I am alittle blown away by all these changes if anyone has any insight on this I would love to hear it?