Abstract: The effects of gasoline detergent on the oxidation stability of gasoline are introduced. Results of variance analysis show that the unwashed gum and washed gum of gasoline having detergent is mainly affected by detergent and secondly by gasoline; while the induction period is mainly depended on gasoline and the detergent has little influence. For induction period, a linear relationship exists between the gasoline having detergent and the base gasoline. Both gum and induction period change linearly with the increase of detergent content in gasoline. With the addition of detergent, the contents of unwashed gum increase significantly in the range of 8.3~ 39.7 mg/100mL (i.e. 2.5 times to 42 times of the base gasoline); the contents of washed gum decrease by 15.0%~83.3%; induction periods vary from -9.0%~14.0%. Therefore, detergent which has little influence on induction period and could reduce washed gum significantly is preferred.

Key words: gasoline, detergent, oxidation stability, gum, induction period