AUS32. Improves mileage. Reduce emissions. Approved for SCR equipped engines. Includes dispensing nozzle! Prime Guard Ultrapure DEF: Prime Guard DEF is a safe, environmentally friendly solution for SCR. Prime Guard DEF is an Ultra-Pure, formaldehyde-free, NOx reducing treatment specifically formulated for diesel engines equipped with SCR systems. Prime Guard DEF meets the stringent AUS 32, DIN 70070, ISO 22241 purity and concentration standards. Meets ISO 22241 specifications. API: American Petroleum Institute certified diesel exhaust fluid. Prime Guard Also Offers: antifreeze; filtration; power steering fluid; belts; gloves; wiper blades; brake fluid; oil. Made in USA.