TRP Aftermarket Parts' CleanBlue diesel exhaust fluid (DEF) can be used in all diesel powered vehicles that use selective catalytic reduction (SCR) technology to reduce nitrogen oxide (NOx) emission. Available in 2 1/2-gallon jugs, 55 gallon drums and large 275 gallon and 300 gallon totes, CleanBlue is clear, non-toxic, non-polluting, non-hazardous, and non-flammable.