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w 代表winter.

本文发表在 rolia.net 枫下论坛前几天借的书:

10w-30

The first number --5 or --10 identifies the cold weather temperature conditions under which the oil provides prompt cold engine starting. If oil thickens too much as it lies dormant in an engine overnight in cold weather, it won't flow readily in the morning wehn you try to start the engine. It will offer resistance, making it more difficult for the starter motor to turn the engine so it will fire up.

The numberals are comparison figures. An oil having a 5 or 10 does not mean that the oil should be used if the temperature is going to drop to 5 F or 10 F above or below zero. The two only indicate that an oil with a 4 flows mroe readily than an oil with a 10. It offers less resistance to engines starting under more extreme cold temperature conditions.


W after 5 or 10 indicates that the oil is suitable for use in winter.

The second set of numerals --30-- indentifies the warm weather temperature conditions under which the oil can be used without becoming too thin to provide the engine with adequate lubrication. This is some discrepancy among manufacturers as to how hot is hot. Some contend that oil having 30 can be used if the ambient temperature is going to be 110 F; other contend that 100 F is limit.更多精彩文章及讨论,请光临枫下论坛 rolia.net
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Replies, comments and Discussions:

  • 枫下家园 / 爱车一族 / 如何自己换机油
    • filed, thanks very much
    • 爱国愤青改修理工了???@@@不错不错,懂得务实就好,HIAHIAHIAHIAHIAHIA
      • 可是在rolia,我发现愤青总是遭到无情的删贴,所以不得不写些别的文章才能生存。
        • 拥抱一下,理解万岁!!!!
          • 小心!机油未干.
            • 小心!身心健康
              • 有拥抱镜头,少儿不宜?
                • 对你的身心健康有一定影响是肯定的,最好在指导下理解
        • 对不起, 我爱你, 愤青大哥.
    • 看见卖的机油有什么10W40、5W30的型号。我知道前者是低温性能,比如10表示零下18度,5表示零下30度;那么W后面的数字表示什么呢?
      • 粘度系数?A BLIND SHOT
        • i'm right
          • 都忘了黏度的国际单位是什么了?和型号的对应关系是什么?40的高还是30的高?
            • 说你上学是尽忙拍拖了你还不认 -- 当然40比30大/高, 小学生都知道嘛 :-)
              前后数字都与粘度有关. W = WINTER. 与你屋里炒菜的油不同, ENGINE OIL 低温时油要稀(所以10/15), 高温时要粘(所以30/45)
      • 最高工作温度30度或40度
        瞎猜的。
        • 嗯,不过你这家伙瞎猜也太离谱,发动机的温度,绝不可能才三四十度。:)
      • 高温性能指标,如何定义的不知道。你老兄设计电机应该要用到呀。很多齿轮箱都用一样的机油
        • 民用的电机都太小太小太小了。
      • -20度时10W启动没有问题,但那几天我加了91号油,可能有作用
        • 机油的作用和启动无关。机油主要是保护转动部件,减少磨损。低温性能好的机油,可以在启动后的一段时间内更好的润滑发动机。
      • w 代表winter.
        本文发表在 rolia.net 枫下论坛前几天借的书:

        10w-30

        The first number --5 or --10 identifies the cold weather temperature conditions under which the oil provides prompt cold engine starting. If oil thickens too much as it lies dormant in an engine overnight in cold weather, it won't flow readily in the morning wehn you try to start the engine. It will offer resistance, making it more difficult for the starter motor to turn the engine so it will fire up.

        The numberals are comparison figures. An oil having a 5 or 10 does not mean that the oil should be used if the temperature is going to drop to 5 F or 10 F above or below zero. The two only indicate that an oil with a 4 flows mroe readily than an oil with a 10. It offers less resistance to engines starting under more extreme cold temperature conditions.


        W after 5 or 10 indicates that the oil is suitable for use in winter.

        The second set of numerals --30-- indentifies the warm weather temperature conditions under which the oil can be used without becoming too thin to provide the engine with adequate lubrication. This is some discrepancy among manufacturers as to how hot is hot. Some contend that oil having 30 can be used if the ambient temperature is going to be 110 F; other contend that 100 F is limit.更多精彩文章及讨论,请光临枫下论坛 rolia.net
        • 请问是什么书名?你要觉得不错的话不妨推荐给大家呵呵
          • 今天被人告知我买的机油是合成(synthetical)机油。不知道有什么好处?
            • 耐热耐久,高温润滑效果更好。可以多跑跑才换
          • 书名叫" Car care Q& A"
            我是随便在图书管拿的一本,正好有这方面的内容。其它的没有看,不过感觉不是很好。你可以查一下。
            ISBN 0471-54479-5
            (我在kitchener)
            • 谢谢!我已买了相应车型的repair manual,还想找一、两本细讲汽车原理知识的经典之作瞅瞅,这样才可能作到既知其然(懂得点维修改装步骤)又知其所以然(原理知识)
              • 我是找到书就看,我相信开卷有益。而且我的旧车manual在图书管也有,我还有数码相机 :)
    • good
    • 支架式千斤顶是用几吨的?Canadian Tire 有好几种。
      • 如果是小车2吨足够。注意要顶在结实可靠的部位,然后,轻轻松开千斤顶,以确认是否顶牢了,再决定可否钻到车底下去,且莫“打了老鼠”。
    • 哪里去找废油的回收商呢?
      • Just bring them to Canadian Tire.
    • 1,车子每5000公里就应该保养一下,8000有点多了。2,很多西人车行换油用的是不错的油。但我去过的所有中国人车行都是用名牌机油瓶子装的劣质油。