DEF is a precisely mixed solution of 32.5 percent high purity chemical grade urea and 67.5 percent de-ionized water. Cat engines equipped with a Selective Catalytic Reduction (SCR) system inject Diesel Exhaust Fluid (DEF) into the exhaust to reduce NOx emissions.The Cat NOx Reduction System (NRS) captures and cools a small quantity of exhaust gas, then routes it back into the combustion chamber where it drives down combustion temperatures and reduces NOx emissions.All Cat engines feature innovative air-management systems that optimize airflow and enhance power, efficiency and reliability.These durable injectors enhance responsiveness while controlling soot. Advanced MEUI-C injector platforms deliver increased injection pressures and more precise fuel rates. Delivering better fuel economy with minimized maintenance costs while providing the same great power and response.Minimized impact of emission systems: designed to be transparent to the operator without requiring interaction.Maximized uptime and reduced cost with world-class support from the Cat dealer network.
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