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Since 1997 a lot of testing programmes on engine and vehicles test benches has been carried out to prove the environmental effects of this emulsified fuel (reduction of NOx, PM and black smoke). The introduction on the world-wide market of new engine and/or post-treatment technologies (common rail, unit injectors and Diesel Particulate Filters) designed to meet the increasingly severe emissions standards represents a major challenge to the producers of emulsified fuels. Indeed, the compatibility of the emulsions with these new hardware technologies must clearly be demonstrated if emulsified fuels want to retain their rank amongst the clean fuels offer. This presentation is addressing this issue by giving an outline of the strategy and test procedures which had to be followed in order to check on the compatibility of the emulsion tested with these technologies being introduced across Europe. In addition, DPF soot loading and regeneration have been investigated.