多級潤滑(hua)油(you)是一種在(zai)(zai)粘溫性(xing)能、工作溫度范(fan)圍和節(jie)能效(xiao)果等方(fang)面具有顯著(zhu)優勢的潤滑(hua)油(you)品。其(qi)特點(dian)在(zai)(zai)于同時含有 W粘度級號和100℃運動粘度級號，且這兩個粘度級號之間的差值至少為15。相比之下，單級潤滑油只標有一個粘度級號，或者雖標有兩個粘度級號但其差值小于15。例如，30號油和40號油是單級油的例子，而20/20W油雖然同時符合20和20W粘度級號油的要求，但這兩個粘度級號之差為0，因此它不被認定為多級油。拓牌汽油機油廠家

     多級潤滑油與(yu)單級潤滑油的(de)(de)主要區別在于粘(zhan)溫(wen)特(te)性。粘(zhan)溫(wen)特(te)性是描述潤滑油粘(zhan)度(du)(du)隨溫(wen)度(du)(du)變(bian)化而變(bian)化的(de)(de)能力，該特(te)性的(de)(de)好(hao)壞通過粘(zhan)度(du)(du)指數(shu)來(lai)表示。粘(zhan)度(du)(du)指數(shu)是通過比(bi)較(jiao)油品在 100℃和(he)40℃的(de)粘(zhan)度值(zhi)計算(suan)得(de)出的(de)。粘(zhan)度指(zhi)數值(zhi)越大，表示該油(you)的(de)粘(zhan)溫性(xing)能越好。多級潤(run)滑油(you)的(de)粘(zhan)度指(zhi)數通常在130以上，而(er)單級潤(run)滑油(you)的(de)粘(zhan)度指(zhi)數一般(ban)為(wei)75～100。

     汽車發動機潤滑油的工作溫度范圍很寬，從發動機起動時的最低油溫到夏季的最高油溫相差很大。如果潤滑油粘度過大，流動性就會降低，輸送性也會變差，導致發動機起動困難或者潤滑油送達潤滑部位的時間過長，容易引起干摩擦，加速機件的磨損。另一方面，當溫度過高時，潤滑油粘度過小，不利于形成流體潤滑油膜而增加摩擦和磨損，甚至造成機件擦傷、拉缸等不良影響。拓牌汽油機油廠家

      多(duo)級潤滑(hua)油在低粘度基礎油中(zhong)加入了粘度指數 劑等成(cheng)分，這解決了低溫起動問題并(bing)改(gai)善了潤(run)滑(hua)性能。因為粘度(du)(du)指數劑是由一(yi)些(xie)具有(you)(you)抗剪切性能的(de)(de)高分子有(you)(you)機化(hua)合(he)物組成(cheng)，它們在高溫時膨脹伸長，增(zeng)加潤(run)滑(hua)油(you)分子之間的(de)(de)阻力(li)，保持一(yi)定(ding)的(de)(de)粘度(du)(du)，形成(cheng)一(yi)定(ding)厚度(du)(du)的(de)(de)油(you)膜，起到應有(you)(you)的(de)(de)潤(run)滑(hua)作用(yong)。而當(dang)低溫時這些(xie)有(you)(you)機化(hua)合(he)物卷曲縮小，懸浮在潤(run)滑(hua)油(you)中，減小潤(run)滑(hua)油(you)分子之間的(de)(de)阻力(li)，使潤(run)滑(hua)油(you)粘度(du)(du)不(bu)致增(zeng)加太多(duo)，以免引(yin)起發動機起動困難和增(zeng)大磨損。

   ;   因此，多(duo)級潤滑油(you)具有(you)(you)良好(hao)的粘(zhan)溫(wen)特性，既有(you)(you)利于(yu)高(gao)低溫(wen)條(tiao)件(jian)下的潤滑，又有(you)(you)利于(yu)低溫(wen)起(qi)動，且(qie)有(you)(you)良好(hao)的減(jian)摩、節能(neng)效果。國外試(shi)驗(yan)證明(ming)使用多(duo)級油(you)時可比單級油(you)降低粘(zhan)性阻力 20％～45％，國內試驗證明各種粘度級號的發動機多級油比單級油節油1％～3％；多級發動機潤滑油與多級齒輪油聯合使用比單級油節油2％～4％。此外，多級潤滑油還有良好的減摩效果。拓牌汽油機油廠家

拓(tuo)牌潤滑(hua)油(you)(you)(you)(you)(you)(you)(you)(you)(you)(you)(you)專(zhuan)注潤滑(hua)行業(ye)15年，全產(chan)業(ye)鏈(lian)產(chan)品100多種，包括工(gong)業(ye)用油(you)(you)(you)(you)(you)(you)(you)(you)(you)(you)(you)：液(ye)壓(ya)(ya)油(you)(you)(you)(you)(you)(you)(you)(you)(you)(you)(you)、機(ji)(ji)(ji)械(xie)油(you)(you)(you)(you)(you)(you)(you)(you)(you)(you)(you)、齒輪油(you)(you)(you)(you)(you)(you)(you)(you)(you)(you)(you)、變壓(ya)(ya)器(qi)油(you)(you)(you)(you)(you)(you)(you)(you)(you)(you)(you)、螺桿壓(ya)(ya)縮機(ji)(ji)(ji)油(you)(you)(you)(you)(you)(you)(you)(you)(you)(you)(you)、真空泵油(you)(you)(you)(you)(you)(you)(you)(you)(you)(you)(you)、導(dao)(dao)熱(re)油(you)(you)(you)(you)(you)(you)(you)(you)(you)(you)(you)、汽輪機(ji)(ji)(ji)油(you)(you)(you)(you)(you)(you)(you)(you)(you)(you)(you)、冷(leng)凍機(ji)(ji)(ji)油(you)(you)(you)(you)(you)(you)(you)(you)(you)(you)(you)、軸承油(you)(you)(you)(you)(you)(you)(you)(you)(you)(you)(you)、主(zhu)軸油(you)(you)(you)(you)(you)(you)(you)(you)(you)(you)(you)、導(dao)(dao)軌(gui)油(you)(you)(you)(you)(you)(you)(you)(you)(you)(you)(you)、軋(ya)鋼機(ji)(ji)(ji)油(you)(you)(you)(you)(you)(you)(you)(you)(you)(you)(you)、高溫(wen)鏈(lian)條油(you)(you)(you)(you)(you)(you)(you)(you)(you)(you)(you)、白油(you)(you)(you)(you)(you)(you)(you)(you)(you)(you)(you)、液(ye)力傳(chuan)動油(you)(you)(you)(you)(you)(you)(you)(you)(you)(you)(you)、錠子油(you)(you)(you)(you)(you)(you)(you)(you)(you)(you)(you)縫紉機(ji)(ji)(ji)油(you)(you)(you)(you)(you)(you)(you)(you)(you)(you)(you)、園林用油(you)(you)(you)(you)(you)(you)(you)(you)(you)(you)(you)等(deng)。金屬(shu)加(jia)工(gong)油(you)(you)(you)(you)(you)(you)(you)(you)(you)(you)(you)：皂(zao)化油(you)(you)(you)(you)(you)(you)(you)(you)(you)(you)(you)、拉拔油(you)(you)(you)(you)(you)(you)(you)(you)(you)(you)(you)、切削(xue)油(you)(you)(you)(you)(you)(you)(you)(you)(you)(you)(you)、防(fang)銹乳化油(you)(you)(you)(you)(you)(you)(you)(you)(you)(you)(you)、線切割乳化油(you)(you)(you)(you)(you)(you)(you)(you)(you)(you)(you)、防(fang)銹油(you)(you)(you)(you)(you)(you)(you)(you)(you)(you)(you)、淬(cui)火油(you)(you)(you)(you)(you)(you)(you)(you)(you)(you)(you)、成型油(you)(you)(you)(you)(you)(you)(you)(you)(you)(you)(you)、壓(ya)(ya)延油(you)(you)(you)(you)(you)(you)(you)(you)(you)(you)(you)、電(dian)火花機(ji)(ji)(ji)油(you)(you)(you)(you)(you)(you)(you)(you)(you)(you)(you)、水(shui)基(ji)金屬(shu)清洗(xi)劑等(deng)。車用油(you)(you)(you)(you)(you)(you)(you)(you)(you)(you)(you)：汽油(you)(you)(you)(you)(you)(you)(you)(you)(you)(you)(you)機(ji)(ji)(ji)油(you)(you)(you)(you)(you)(you)(you)(you)(you)(you)(you)、柴油(you)(you)(you)(you)(you)(you)(you)(you)(you)(you)(you)機(ji)(ji)(ji)油(you)(you)(you)(you)(you)(you)(you)(you)(you)(you)(you)、車輛齒輪油(you)(you)(you)(you)(you)(you)(you)(you)(you)(you)(you)、制動液(ye)、傳(chuan)動系統油(you)(you)(you)(you)(you)(you)(you)(you)(you)(you)(you)、發(fa)動機(ji)(ji)(ji)冷(leng)卻液(ye)、減震器(qi)油(you)(you)(you)(you)(you)(you)(you)(you)(you)(you)(you)、自動變速箱油(you)(you)(you)(you)(you)(you)(you)(you)(you)(you)(you)等(deng)。船(chuan)(chuan)用油(you)(you)(you)(you)(you)(you)(you)(you)(you)(you)(you)：中速筒狀活塞柴油(you)(you)(you)(you)(you)(you)(you)(you)(you)(you)(you)機(ji)(ji)(ji)油(you)(you)(you)(you)(you)(you)(you)(you)(you)(you)(you)、船(chuan)(chuan)用系統油(you)(you)(you)(you)(you)(you)(you)(you)(you)(you)(you)、船(chuan)(chuan)用汽缸油(you)(you)(you)(you)(you)(you)(you)(you)(you)(you)(you)、中小船(chuan)(chuan)專(zhuan)用柴油(you)(you)(you)(you)(you)(you)(you)(you)(you)(you)(you)機(ji)(ji)(ji)油(you)(you)(you)(you)(you)(you)(you)(you)(you)(you)(you)等(deng)。潤滑(hua)脂：鋰(li)基(ji)脂、鈣基(ji)脂、復合高溫(wen)潤滑(hua)脂、極壓(ya)(ya)鋰(li)基(ji)脂、半(ban)流體鋰(li)基(ji)脂、二硫化鉬鋰(li)基(ji)脂、白色特(te)種脂、硅脂、高溫(wen)脂、低噪音脂、高速軸承脂、食品級潤滑(hua)脂等(deng)。