在新西兰
请问2000 nissan primera 和 2009 toyota yaris 应该选择 15w-40的机油还是 10w-30 的？有人说比较老得发动机要用20w-30的..........请教请教...........
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同求 01 primera.
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2000年的霹雳马用15w40的可以，比较保险。即使公里数高点也不会烧机油。用30的估计无大碍，但有点悬。 w之前那个数字基本不用看 是低温粘度指数。奥克兰不冷，没关系的。主要看后面那个30、40、50之类的。
09年的yaris应该是首选用30的机油的。车体铭牌上一般会注明的。
另外叫你用20w30的机油的那个人，不要相信ta对车的任何判断。
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3# netghost1861
w之后的30,40,50是什么意思呢？
我的truck是2005 ISUZU ELF, 它有DPD SYSTEM, 发动机上的日文注明[email=“@#%]“@#%[/email]。。# DPD 专用油”，做保养的修车厂说必须而且只能用 5w-30，否则后果很严重，是这样的吗？？
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2000年过后的车，在Auckland 这边的话10w30就可以了，如果再南面的话换5w30的
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15w-40 ~!!!!!!!
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When you see a W on a viscosity rating it means that this oil viscosity has been tested at a Colder temperature. The numbers without the W are all tested at 210° F or 100° C which is considered an approximation of engine operating temperature. In other words, a SAE 30 motor oil is the same viscosity as a 10w-30 or 5W-30 at 210° (100° C). The difference is when the viscosity is tested at a much colder temperature. For example, a 5W-30 motor oil performs like a SAE 5 motor oil would perform at the cold temperature specified, but still has the SAE 30 viscosity at 210° F (100° C) which is engine operating temperature. This allows the engine to get quick oil flow when it is started cold verses dry running until lubricant either warms up sufficiently or is finally forced through the engine oil system. The advantages of a low W viscosity number is obvious. The quicker the oil flows cold, the less dry running. Less dry running means much less engine wear.
Obviously, cold temperature or W ratings are tested differently than regular SAE viscosity ratings. Simply put, these tests are done with a different temperature system. There is a scale for the W, or winter viscosity grades and, depending on which grade is selected, testing is done at different temperatures. See the Tables to the right below for more information.
Basically to determine non-winter grade viscosity using a viscometer a measured amount of oil at 100° C is allowed to flow through an orifice and timed. Using a table they determine SAE viscosity based on different ranges. Thicker or heavy viscosity oils will take longer to flow through the orifice in the viscometer and end up in higher number ranges such as SAE 50 or SAE 60 for example. If an oil flows through faster being thinner/lighter then it will wind up in a low number range such as SAE 10 or SAE 20 for example. Occasionally it is possible for an oil to barely fall into one viscosity range. For example, an oil is barely an SAE 30 having a time that puts it on the very low side. Then another oil is timed to be an SAE 20 on the high side not quite breaking into the SAE 30 numbers. Technically speaking these oils will be close to the same viscosity even though one is an SAE 20 and the other an SAE 30. But you have to draw the line somewhere and that's how the SAE system is designed. Another system takes more accurate numbers into account known as cSt abbreviated for centistokes. You'll see these numbers used often for industrial lubricants such as compressor or hydraulic oils. The table at the right, SAE Viscosity Chart (High Temp), shows the equivalents for cSt and SAE viscosity numbers. You'll see the ranges for cSt compared to SAE numbers. An oil that is 9.2 cSt will be nearly the same viscosity as an oil that is 9.3 cSt, yet one is an SAE 20 and the other is an SAE 30. This is why the cSt centistokes numbers more accurately show oil viscosity.
Now if you look at the table labeled Winter or "W" Grades, you can get valuable information on how the W or winter grade viscosities are measured. Basically, as shown by the chart, when the oil is reduced to a colder temperature it is measured for performance factors. If it performs like a SAE 0 motor oil at the colder temperature, then it will receive the SAE 0W viscosity grade. Consequently, if the motor oil performs like a SAE 20 motor oil at the reduced temperatures (the scale varies - see the chart), then it will be a SAE 20W motor oil.
If a motor oil passes the cold temperature or W (winter grade) specification for a SAE 15W and at 210° F (100° C) flows through the viscometer like a SAE 40 motor oil, then the label will read 15W-40. Getting the picture? Consequently, if the motor oil performs like a SAE 5 motor oil on the reduced temperature scale and flows like a SAE 20 at 210° F (100° C), then this motor oil's label will read 5W-20. And so forth and so on!
I can't tell you how many times I have heard someone, usually an auto mechanic, say that they wouldn't use a 5W-30 motor oil because it is, "Too thin." Then they may use a 10W-30 or SAE 30 motor oil. At engine operating temperatures these oils are the same. The only time the 5W-30 oil is "thin" is at cold start up conditions where you need it to be "thin."
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7# beck@
大佬，你可以告诉我什么是DPD SYSTEM 吗？为什么我的truck必须用5w-30？之前我不知道这个问题，好几次换机油时都用了15w-40，结果整个computer错乱，发动机失去动力，以致引发feul injector问题，前前后后花了将近7000刀才修好.................
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Dual Point Distributor 双白金分电器 在电子打火系统发明之前 老式high performance车用这样的点火系统。。后来发明了electronic ignition 。代替了
我也不清楚为什么你一定要用5W-30的。 首先5W是在-30℃可以保证车辆发动机的启动和润滑，30表示机油在100℃的机油粘度。所以5w-30的意思是在-30℃环境下的低粘度机油
但按照NZ的气候。。15W足够了。。因为好像在NZ。特别是AKL 没到过-30度。
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ERR......
我一直被告知W前面那个数字代表机油的净度。。。号越小的越顺滑。。。。
后面那个数字是发动机高温时的粘稠度，号越高越贵。。。。
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W 是 winter的意思。 W前面的是 零下多少度的坏境 越低 说明 温度越低
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11# beck@
大佬， 我估计我的“DPD"并不是指打火器，因为那个ISUZU的洋人说这是一个 reduce ash and clean the engine的system. 在我的truck右手边那一排按钮上就有一个DPD按钮，当DPD指示灯亮起时，我必须把truck停一边，保持引擎运转，持续按DPD按钮3秒以上，DPD灯由闪烁变为持续亮着，这时候DPD SYSTEM在工作，发动机的转速有所增高，尾气排放也比一般停车的时候大。洋人说这是DPD在clean and refresh engine. 但如果定期更换正确的机油，这种DPD “闪亮”的情况是不会发生的。还有，每隔2-3日或者300-400公里，DPD system会进行小的“refresh”， 在这个时候，会发现exhaust break 自我启动，每当车停下来的时候（例如等红灯），exhaust break activated, 当车子入档启动踩油门的时候，排气管会“大排气”一下，可以很清楚地听到排气的声音，就像平时手动开启exhaust break的声音一样，过了大概20-30分钟，特别是在这期间走一段高速，这种DPD自我refresh就会停止，一切恢复正常，但刚恢复的时候，能明显感觉发动机有规律地颤抖，但过一会它又没事了，我觉得可能之前DPD出了问题，没有彻底解决..................
不知道大佬能否看明白我说的，因为自己不是这个专业的，所以也只能说到这个水平了。大佬是否对light commercial truck有研究？如果行的话，我以后的service 就在你那做，希望能便宜些，那洋人是在是“抢钱”！！！
另：我看了洋人的service单子，上面的机油是5w-30 synpower
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你PM一下我 你的联系方式。。我星期1 联系你。 电话里说 比较方便。。。。
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Diesel Particulate Diffuser = DPD这是一个对柴油发动机尾气后处理的装置，这个技术自2004年在日本出现。就是将柴油发动机尾气中的颗粒过滤，当积攒到一定程度时，自动或手动燃烧这些颗粒，使过滤装置再生。作用和尾气的三元催化差不多，不过具有再生功能。对机油的要求高，我想是因为机油粘度不同，尾气中的颗粒含量会不同，过多的颗粒会把这个过滤器完全糊住，所以系统会不停地要求对装置进行再生。
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请看下图中DPD所处的位置。
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14# safari96
有图有真相。豁然开朗，十分感谢。我想这就是DPD需要5w-30 synpower 的原因。
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我想:这个型号的机油,应该是较多普遍使用范围吧
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首先 toyota 现在 原厂指定机油是 10w --40
后面帖子提到 的 DPF or DPD 系统， 如果出现经常 工作或者堵塞警告灯亮起无法自动还原， 首先检查 发动机油的油面高度， 正常情况下 应该在 LOW 的位置，最高也不能高过 Low 和 high 中间的位置， 90% 的车在保养后出现 DPF灯亮起 都是因为机油量加的过高而引起的。