There are certain places, and actually sulfur free diesel is available at the pumps in several places around the world. 18 stations in Scotland for instance already carry only Sulfur free diesel. btw, "Sulfur Free" isn't 100% free, it's just 10 PPM or less. Not as easy as even vegetable oil. You can toss a smoke into a bucket of diesel and it will just go out. Diesel powered vehicles use glo-plugs, not spark plugs. <{POST_SNAPBACK}> Yeah the way a deiesel engine works is that the fuel is actually squirted into the chamber and is ignited with the friction of the compression of the chamber, not the "spark".