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無(wu)鉛(qian)(qian)(qian)(qian)汽(qi)(qi)(qi)(qi)油中只含有(you)(you)(you)來源于原油的(de)(de)(de)微量的(de)(de)(de)鉛(qian)(qian)(qian)(qian)，一(yi)般每(mei)升汽(qi)(qi)(qi)(qi)油為百分之(zhi)一(yi)克。 它(ta)的(de)(de)(de)辛烷值為95， 比現有(you)(you)(you)其(qi)他(ta)級別含鉛(qian)(qian)(qian)(qian)汽(qi)(qi)(qi)(qi)油的(de)(de)(de)辛烷值(97)略低。使(shi)用(yong)無(wu)鉛(qian)(qian)(qian)(qian)汽(qi)(qi)(qi)(qi)油能有(you)(you)(you)效(xiao)控制(zhi)汽(qi)(qi)(qi)(qi)車(che)廢氣(qi)(qi)中的(de)(de)(de)有(you)(you)(you)害(hai)物質，減(jian)少碳氫化(hua)合物(HC造成(cheng)煙霧)、一(yi)氧化(hua)碳(CO有(you)(you)(you)毒)及氮氧化(hua)物(NOx形成(cheng)酸雨)等污(wu)染。要減(jian)少排(pai)污(wu)最有(you)(you)(you)效(xiao)、最簡單的(de)(de)(de)方法就是在排(pai)氣(qi)(qi)系(xi)統中加裝(zhuang)(zhuang)催(cui)化(hua)轉(zhuan)換器，而汽(qi)(qi)(qi)(qi)油含鉛(qian)(qian)(qian)(qian)量每(mei)升超過0.013克時，就會使(shi)催(cui)化(hua)劑(ji)失效(xiao)，從而達(da)不到(dao)控制(zhi)汽(qi)(qi)(qi)(qi)車(che)廢氣(qi)(qi)的(de)(de)(de)目(mu)的(de)(de)(de)。這個臨界量即為界定無(wu)鉛(qian)(qian)(qian)(qian)汽(qi)(qi)(qi)(qi)油的(de)(de)(de)標準。使(shi)用(yong)無(wu)鉛(qian)(qian)(qian)(qian)汽(qi)(qi)(qi)(qi)油的(de)(de)(de)汽(qi)(qi)(qi)(qi)車(che)，其(qi)發動(dong)機上(shang)必(bi)須裝(zhuang)(zhuang)有(you)(you)(you)無(wu)需鉛(qian)(qian)(qian)(qian)潤滑(hua)的(de)(de)(de)硬化(hua)閥座(zuo)。如果沒有(you)(you)(you)，便要在每(mei)使(shi)用(yong)數缸(gang)無(wu)鉛(qian)(qian)(qian)(qian)汽(qi)(qi)(qi)(qi)油后，使(shi)用(yong)一(yi)缸(gang)含鉛(qian)(qian)(qian)(qian)汽(qi)(qi)(qi)(qi)油以(yi)潤滑(hua)閥座(zuo)。其(qi)次，催(cui)化(hua)轉(zhuan)換器也須配合一(yi)些特殊的(de)(de)(de)發動(dong)機系(xi)統包括汽(qi)(qi)(qi)(qi)油噴嘴(zui)及電子(zi)點火裝(zhuang)(zhuang)置(zhi)等。大部(bu)分汽(qi)(qi)(qi)(qi)車(che)可使(shi)用(yong)無(wu)鉛(qian)(qian)(qian)(qian)汽(qi)(qi)(qi)(qi)油，還有(you)(you)(you)一(yi)部(bu)分汽(qi)(qi)(qi)(qi)車(che)需經調校改(gai)裝(zhuang)(zhuang)才能使(shi)用(yong)。