Due to the increased sales of diesel passenger cars and SUVs, including those recently caught gaming the emissions system, a greater number of traditional, on-highway filling stations now have diesel’s green pumps. However, pumps that offer diesel exhaust fluid (DEF) continue to be few and far between.
Since 2010, many diesels are required to have DEF, a mix of two-thirds water and one-third urea, to run their higher-emissions controls. As a result, highway truck stops stock DEF at diesel pumps, while automotive parts shops and dealerships offer DEF jugs at a higher price. As with fuel, jobsites also may have bulk DEF for on- and off-road vehicles.