→Subscribe for new videos every day! https://www.youtube.com/user/TodayIFoundOut?sub_confirmation=1 →How "Dic“” was used in early model cars to help reduce engine knocking, boost octane ratings, and help with wear and tear on valve seats within the motor. Due to concerns over air pollution and health risks, this type of gas was slowly phased out starting in the late 1970’s and banned altogether in all on-road vehicles in the U.S. in 1995. Want the text version?: http://www.todayifoundout.com/index.php/2011/11/why-lead-used-to-be-added-to-gasoline/ Sources: http://www.thenation.com/article/secret-history-lead?page=full http://www.mayoclinic.com/health/lead-poisoning/FL00068 http://science.howstuffworks.com/gasoline1.htm http://www.google.com/hostednews/ap/article/ALeqM5h2j0TzmQV86Pjh8gpDk11BQzT_Zg?docId=fa60a04afec342729f7a64020bda6325 http://www.chemcases.com/tel/ http://www.imperialclub.com/Repair/Lit/Master/291/page13.htm http://www.chm.bris.ac.uk/motm/bal/development.html http://www.myessentia.com/blog/blog/2011/10/30/united-nations-doing-away-with-leaded-gasoline/