Abstract: The physiochemical properties and effect on diesel fuel storage stability of additive newly prepared by compound optimization technology were investigated quantitatively. The results show that the new additives have a better comprehensive performance than the similar ones of US army. The worse the storage stability of diesel fuel, the more obvious inhibition effect on existent gum formation is. The new additives can effectively reduce the total insoluble matter, and the total insoluble content decline rate is directly proportional to the severity of diesel quality decay. But the additives prepared have no influence on the acidity and color of the oil tested. The results confirm that the insoluble matter can be used as a quality index for diesel storage stability. It is expected the compound additive can make the diesel storage life span more than 1.6 times.

Key words: diesel fuel, storage stability, additive, storage life, total insoluble matter