抄録
In Japan all the lead additives in both premium and regular gasolines are to be removed from April 1, 1974. This project not only has a great influence on our refineries technically and economically, but also poses many problems on manufacturing and using thereof. As far as the former is concerned, it includes such problems as how to manufacture the well balanced unleaded gasoline, in connection with this, the restriction of gasoline composition, how to select the suitable octanebooster, and manufacturing cost up.The latter includes valve sheet recession and knocking troubles of the older cars without new devices. Here, the author briefly discusses these problems .
