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Diesel Particle Filters (DPFs) using a fuel-borne catalyst to assist filter regeneration provide a uniquely advantaged DPF technology. More than 5 million diesel passenger cars in the market today are equipped with this after-treatment system. Based on this extensive field experience, improvements have been made to the durability and maintenance requirements of this technology, and the total system cost has been optimized. Recently, a new fuel-borne catalyst, Eolys Powerflex™ (named new Fe-based FBC) has been developed to provide solutions that comply with current Euro 5 and forthcoming Euro 6 requirements that take into account both regulated emissions and optimization of CO₂ emissions. This paper presents the benefits of this optimized product. The soot oxidation activity of this new Fe FBC has been tuned to ensure fast and complete regeneration at low temperature and very low dosing rates in the fuel, thus reducing ash accumulation and improving the overall system durability.