I bought a new Ford F350 at the first of this year. Because it is a 2011 I have to add diesel exhaust fluid, what a pain. Does anyone know a work around to this so I don't have to keep buying this stuff. It uses about 5 gallons every 6,000 miles. I really have not kept accurate track of this so my figures might be off. But it did cost me about $22 for the last 5 gallons.