AdBlue® (Diesel Exhaust Fluid / Aqueous Urea Solution) Available Pack Size: 10L / 1000L SKU Code: DEF-10L / DEL-1000L A high-quality, urea-based Diesel Exhaust Fluid (DEF), also known as Aqueous Urea Solution (AUS 32), designed to reduce air pollution produced by diesel engines. This environmentally friendly, cost-effective, and easy-to-use solution helps diesel vehicle owners comply with emission standards while maintaining optimal engine and SCR system performance.