It was found that at idling, 67% of mass was soluble in benzene while at full load it was only about 24%. Elemental carbon content increased with increase in load showinga maximum of 48% at 70% load and a minimum of 25% at idling. The trend of organic carbon was quite opposite; it showed 35% organic carbon at idling, which decreased gradually with increase in load. This research has suggested that composition of diesel exhaust particles varies significantly with varying engine load conditions.