I hear that very soon there will be a new grade of diesel fuel on the market. If any of you know about this, I would be interested to know if all of the older diesels would be able to run on the new diesel fuel. A salesman told me the '07's would be able to run on either, but the anything older would not. I don't know if he was trying to sale me a '07 or if it is true. Let me know what you guys have heard.