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Diesel Particulate Filter (DPF) and Selective Catalytic Reduction (SCR) is your emission control system. A key component of SCR is Diesel Exhaust Fluid (DEF). If not taken care of it will take you into a 5 mph derate.

• The manufacturer recommends you service your exhaust system every 150,000 miles. This includes Aftertreatment, Fuel Injector, and DEF filters.

• Your DPF filters need to be serviced every 400,000 miles.