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The Doosan DX300LC excavator combines performance and comfort enhancements with interim Tier 4 technologies. The DX300LC is powered by a 213 horsepower, 6-cylinder Doosan DL08K water-cooled diesel engine that has been optimized for use with a cooled exhaust gas recirculation (CEGR) system, diesel oxidation catalyst (DOC) and diesel particulate filter (DPF). The engine in this configuration is optimized to reduce nitrogen oxides and after treatment is needed to reduce particulate matter to comply with interim Tier 4 (iT4) emission regulations. The 466-cubic-inch engine features a variable geometry turbocharger to provide optimized boost and a high pressure common rail design with direct fuel injection, electronic control and four valves per cylinder to improve fuel efficiency.