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A highly robust Diesel Oxidation Catalyst (DOC) for use with a dual mode combustion system, which makes it possible to switch the combustion between conventional mode and PCI (Premixed Compression Ignition) Combustion mode, was studied. Firstly, commercially available DOCs were tested to confirm current level of emission reduction efficiency for a simulated dual mode combustion system, where CO (Carbon monoxide) was varied from 500 to 5,000 ppm, HC (Hydrocarbon) was varied from 500 to 5,000 ppmC and O2 (Oxygen) was varied from 2 to 15%, respectively. A commercially available Pt based DOC showed good CO and HC light-off performance at 500 ppm of CO and HC at up to 10% O2. However, it did not keep the superior light-off activity when CO and HC were increased to 5,000 ppm and O2 was decreased to 2%. A commercially available Pt-Pd based DOC demonstrated better light-off activity compared to the Pt based DOC at lower CO and HC concentrations.