 Diesel vehicle emission controls begin with proper maintenance and fluids, like DEF or diesel exhaust fluid. Featuring a mixture of high-purity synthetic urea and deionized water used in SCR, or selective catalytic reduction, Blue DEF diesel exhaust fluid offers a purity guarantee to meet or exceed the strictest OEM standards. And Blue DEF Platinum features advanced system shield technology, which includes a proprietary formula to tackle deposits built up in the SCR system. You can learn more at peakauto.com.