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Why the Bosch DEF Urea Filter (1-457-436-088) Should Be Part of Your Regular Maintenance Schedule In the world of diesel-powered medium and heavy-duty trucks, performance and compliance go hand in hand. Since January 1, 2010, EPA Emission Standards have required trucks to significantly reduce nitrogen oxide (NOx) emissions. Most manufacturers have adopted Selective Catalytic Reduction (SCR) technology to meet these standards—and at the heart of this system lies a small but critic …