Shelf Life of Ad Blue ( also called as Diesel Exhaust Fluid /DEF /AUS32) It is recommended that DEF be stored out of the direct sunlight and below 35 degC. Where higher ambient temperatures are experienced, tanks should be insulated or stored in a shaded area.The storage temperature range between 10 ℃ and 35 ℃, the shelf life floating in 12 to 36 months in this range. The shelf life is DEF defined...