Product Details: Ensured with Expertise Built In™, the OTR Diesel Oxidation Catalyst (DOC) for ISX is a crucial part of the DPF’s thermal management. This heavy duty diesel oxidation catalyst oxidizes and gets rid of unburned hydrocarbons, soluble organic fraction, carbon monoxide, and unregulated contaminants from on-highway diesel truck’s emissions. FleetPride is your First Click in Heavy Duty®.