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...Cummins aftertreatment overview maintenance guidelines isx diesel particulate filter dpf replace or clean mi km recon program available for epa def pump next slide details what is a bad and good at interval normal darkened element urea odor absence of large particles contaminated grease like substance hydrocarbon separated from similar appearance on both filters contaminant in tank remove flush lines dark yellow likely fuel the quality sensor new regulations assembly level temperature now fitted with must detect concentration use meeting iso specifications purity composition store cool dry well ventilated area out direct sunlight optimum storage up to deg f c temporary exposure higher temperatures has little no impact expectation shelf life one year as long it properly stored potentially two if does not exceed extended time there are engine derates associated spec running low...