Sure there will be various opinions on this controversial subject. I used a lead additive for years but based on all the literature and internet discussions I could find on the subject, it appeared to me this is not necessary, at least based on my driving scenario. I use 93 octane non-ethanol gas in my Kaisers and Frazers now. Until they started disappearing in this southeast area within the last couple of years, I used BP 93 octane for many years because it was believed that had no ethanol. I do not drive my cars long distances or pull trailers or go over 65 mph and travel just a few hundred miles a year. I have owned a Kaiser since 1994.