DINEX Diesel Oxidation Catalyst for Paccar MX-13 Engines Pancake Inlet DOC is a direct-fit inlet catalyst engineered for heavy-duty Paccar powertrains running Cummins MX-13 family configurations meeting EPA17/EPA21 emissions requirements. This unit addresses the operational problem of elevated tailpipe hydrocarbons and carbon monoxide that impede aftertreatment performance and can prevent effective DPF/SCR operation. By providing a high-activity oxidation substrate in a compact pancake-style housing, the catalyst converts CO and unburned hydrocarbons into less harmful constituents and promotes formation of exhaust species that enable downstream passive regeneration and SCR dosing efficiency. For fleets, that translates to measurable outcomes: improved passive regeneration frequency, reduced DPF active-regeneration cycles, and more stable backpressure profiles that help preserve engine fuel efficiency and extend DPF service intervals. The product is supplied complete with required installation clamps and gaskets and is available as a factory-style replacement that aligns with common OEM cross-reference numbers for Paccar MX-13 applications. Physical footprint and mass make it practical for tight inlet locations: nominal external dimensions approximately 15.13L x 15.13W x 9.33H in and weight near 48 lb, enabling straightforward integration in in-line aftertreatment configurations. Intended for direct replacement in specified Paccar/Cummins installations, this DINEX DOC helps maintain regulatory emission performance while minimizing maintenance downtime. The design focus on durable substrate media and robust housing supports consistent conversion efficiency across normal duty cycles, helping fleets reduce service events and manage total cost of ownership for modern diesel tractors and vocational vehicles.