Seeking both to meet customer demand and to buy time for further engineering, Navistar International Corp. is making available another Cummins diesel engine equipped with an SCR (selective catalytic reduction) emissions-aftertreatment system. The medium-duty truck and bus models getting this Cummins engine will continue to be offered as well with the manufacturer’s own  MaxxForce  engines, which continues to use EGR (exhaust-gas recirculation) ...

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