汽(qi)(qi)(qi)油(you)(you)(you)(you)在其(qi)正(zheng)常(chang)的(de)(de)(de)(de)(de)儲(chu)存(cun)與(yu)使用(yong)過程(cheng)中(zhong)，保持(chi)其(qi)性(xing)(xing)(xing)(xing)質(zhi)長(chang)期(qi)(qi)(qi)(qi)穩定(ding)(ding)(ding)(ding)性(xing)(xing)(xing)(xing)的(de)(de)(de)(de)(de)能(neng)力，稱作為汽(qi)(qi)(qi)油(you)(you)(you)(you)的(de)(de)(de)(de)(de)氧(yang)化(hua)安(an)定(ding)(ding)(ding)(ding)性(xing)(xing)(xing)(xing)。油(you)(you)(you)(you)品的(de)(de)(de)(de)(de)氧(yang)化(hua)安(an)定(ding)(ding)(ding)(ding)性(xing)(xing)(xing)(xing)取決于(yu)汽(qi)(qi)(qi)油(you)(you)(you)(you)不(bu)(bu)飽(bao)(bao)和(he)烴(jing)和(he)有害雜質(zhi)的(de)(de)(de)(de)(de)含量(liang)。在一定(ding)(ding)(ding)(ding)條件（溫度(du)、空氣中(zhong)的(de)(de)(de)(de)(de)氧(yang)、金屬的(de)(de)(de)(de)(de)催化(hua)作用(yong)、陽光等）下(xia)，不(bu)(bu)飽(bao)(bao)和(he)烴(jing)迅(xun)速(su)(su)(su)氧(yang)化(hua)、聚合、生(sheng)成膠狀(zhuang)(zhuang)物質(zhi)和(he)酸類。膠狀(zhuang)(zhuang)物質(zhi)的(de)(de)(de)(de)(de)積累會迅(xun)速(su)(su)(su)惡化(hua)汽(qi)(qi)(qi)油(you)(you)(you)(you)的(de)(de)(de)(de)(de)適用(yong)性(xing)(xing)(xing)(xing)能(neng)。那么評(ping)定(ding)(ding)(ding)(ding)汽(qi)(qi)(qi)油(you)(you)(you)(you)氧(yang)化(hua)安(an)定(ding)(ding)(ding)(ding)性(xing)(xing)(xing)(xing)的(de)(de)(de)(de)(de)指(zhi)標又是什(shen)么呢？評(ping)定(ding)(ding)(ding)(ding)汽(qi)(qi)(qi)油(you)(you)(you)(you)氧(yang)化(hua)安(an)定(ding)(ding)(ding)(ding)性(xing)(xing)(xing)(xing)的(de)(de)(de)(de)(de)主(zhu)要指(zhi)標有碘值、硫含量(liang)、酸度(du)、實(shi)際膠質(zhi)、誘導(dao)期(qi)(qi)(qi)(qi)等。其(qi)中(zhong)誘導(dao)期(qi)(qi)(qi)(qi)是指(zhi)：汽(qi)(qi)(qi)油(you)(you)(you)(you)在一定(ding)(ding)(ding)(ding)條件下(xia)（100℃，氧(yang)氣壓(ya)力7*98.0665kPa）與(yu)氧(yang)氣接觸，從開(kai)始(shi)到汽(qi)(qi)(qi)油(you)(you)(you)(you)吸收氧(yang)氣加速(su)(su)(su)氧(yang)化(hua)、壓(ya)力明顯下(xia)降為止所經歷的(de)(de)(de)(de)(de)時間稱為汽(qi)(qi)(qi)油(you)(you)(you)(you)的(de)(de)(de)(de)(de)誘導(dao)期(qi)(qi)(qi)(qi)，單位(wei)為min。汽(qi)(qi)(qi)油(you)(you)(you)(you)的(de)(de)(de)(de)(de)誘導(dao)期(qi)(qi)(qi)(qi)時間越(yue)(yue)短，安(an)定(ding)(ding)(ding)(ding)性(xing)(xing)(xing)(xing)越(yue)(yue)差，生(sheng)成膠質(zhi)的(de)(de)(de)(de)(de)速(su)(su)(su)度(du)越(yue)(yue)快，國標中(zhong)規定(ding)(ding)(ding)(ding)誘導(dao)期(qi)(qi)(qi)(qi)不(bu)(bu)小于(yu)480min（480分鐘）。 誘導(dao)期(qi)(qi)(qi)(qi)長(chang)，在一定(ding)(ding)(ding)(ding)程(cheng)度(du)上說明汽(qi)(qi)(qi)油(you)(you)(you)(you)的(de)(de)(de)(de)(de)氧(yang)化(hua)安(an)定(ding)(ding)(ding)(ding)性(xing)(xing)(xing)(xing)好，這種汽(qi)(qi)(qi)油(you)(you)(you)(you)適合長(chang)期(qi)(qi)(qi)(qi)儲(chu)存(cun)。 

實(shi)(shi)際(ji)膠(jiao)質(zhi)(zhi)：實(shi)(shi)際(ji)膠(jiao)質(zhi)(zhi)是指(zhi)100ml燃料在國(guo)標方(fang)法(fa)試驗條件下所測(ce)得的(de)不揮發(fa)物的(de)毫(hao)克(ke)數，單位是mg/100ml.實(shi)(shi)際(ji)膠(jiao)質(zhi)(zhi)的(de)大小衡量燃料在使(shi)用(yong)過程中，在進氣(qi)道和進氣(qi)閥上生成的(de)沉(chen)積物的(de)傾(qing)向(xiang)，若實(shi)(shi)際(ji)膠(jiao)質(zhi)(zhi)過大，會縮短*行駛(shi)里程數。

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