Lubriguard 720015 DEF Fuel Additive, 1 gal (Pack of 4)

Non-toxic, clear urea solution for use as a reducing agent for selective catalytic reduction systems in diesel-powered vehicles. Breaks down toxic NOx emissions. Stored in a supplementary tank on the vehicle. DEF is a 32.5% aqueous urea solution. Complies to global quality standards DIN 70070 and ISO 22241. Meets all EPA standards and bears the American Petroleum Institute API symbol.