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The effect of diesel fuel properties and composition on regulated emissions has been investigated in an IDI naturally aspirated passenger car equipped with an oxidation catalyst. The influence of diesel fuel changes on emissions from this same vehicle without the catalyst have been reported in a previous SAE paper (1).* The addition of the catalyst to this ‘clean’ car further reduced emissions, especially those of hydrocarbons and carbon monoxide. Particulate emissions were reduced to below the proposed 1996 European limit of 0.08 g/km. The catalyst was especially effective in reducing particulates from the higher density fuels, but had no influence on NOx. The catalyst was ‘sulphur tolerant’; changes in fuel sulphur content between 0.01 and 0.2% wt sulphur had a an insignificant effect on particulate emissions. Variations in fuel properties produced a significant influence on emissions, although the effect was less in this car, with a catalyst, than in the non-catalyst version.