I would like to ask you what is the difference between 5W-30 oil and 0W-30 oil?
According to most self-media and the so-called "player" mouth, basically will be described like this: the next 30, is to indicate the high temperature viscosity of the oil, the larger the number, the more viscous. The first few W represent winter, and the number on the left side of W represents the minimum temperature at which the oil is used.
Then the following picture was given to the po, and this "ancient" knowledge was carefully said.
For example, 5 means that the minimum temperature of the oil used is minus 30 degrees, so it means that the oil will become very viscous and difficult to flow at minus 30 ° C. 0 means that the minimum temperature of the oil is -35 degrees, for the same reason.
Therefore, many media and players have concluded from this:
It is recommended that summer and southern car owners can use 5W of lubricating oil, and winter and northern owners recommend using 0W of lubricating oil.
So the 5W and 0W labels really have no other meaning than to illustrate low temperature fluidity?
Then today Tai Ge came to talk briefly with the masters, and the label of the oil revealed what the owners did not know in addition to the high and low temperature viscosity.
The true meaning of the oil label
It is the "front and rear two-stage" viscosity of modern lubricants
First of all, I would like to say that this method of description on the Internet is basically correct and not wrong, but it is not thorough and thorough. In fact, the number in front of the oil label letter W has other meanings besides indicating the minimum temperature of oil used.
Nowadays, lubricating oil is called "two-stage oil", in the most popular words, it is the "dual-use formula" of "summer oil + winter oil".
Continuing with our common examples of 5W-30 and 0W-30:
5W-30 oil, high temperature viscosity level is 30, which means "equivalent to the viscosity of no. 30 summer oil". So what does 5W really mean? In fact, it means that "the viscosity of this oil at low temperatures is equivalent to the viscosity of winter oil on No. 5".
5W-30 makes sense, then 0W-30 of course does not need to be explained, and it can be understood by putting it in the above text. Therefore, 5W-30 oil is more viscous than 0W-30 oil at low temperatures. The reverse is that 0W-30 oil has better fluidity at low temperatures than 5W-30 oil.
So the oil label we talked clearly, then 5W and 0W lubricating oil in addition to the label can also talk about what to come out?
Next, Tiger gave everyone dry goods!
The same label, 0W material is better
There has always been a saying in the anecdotes and oil circles that "0W has no weak oil"
First of all, correct everyone's idea, this statement is mainly from the viscosity of 0W40 oil. Its core is the core of the "double-level label": "span".
0W40 this indicator of lubricating oil, because the high temperature 100 °C viscosity to meet less than 16.3, but also to meet the low temperature 0 °C 3.8 viscosity requirements. This large "span" of viscosity requirements, so that manufacturers in order to adapt to the "double label" have to adjust the lubricating oil base oil or additive materials to adapt.
So the result is very simple, the larger the two-stage span of the lubricating oil, usually has a better base oil, better additives, usually gives people a better driving experience.
The 5W series of lubricants is not necessarily weak, for example, 5W40 has better "thermal stability" than 0W40, and many high-performance oils will also be 5W models, suitable for long-term high-rev. Different formulations, the test data is also different. "Evaporation loss" and "four-ball grinding spot" determine the level of burner oil and the level of wear resistance.
If you usually drive mainly to buy vegetables, pick up children, the pursuit of quiet and smooth and fuel economy, you can choose 0W oil. On the contrary, if you like long-term intense driving, as long as you drive to maintain the engine high rotation zone of the car owners, you need to give up low temperature performance, in exchange for better high temperature thermal stability, to ensure that the oil film does not break.
So 0W no weak oil is not pure absolute!
This sentence is only for 40 viscosity lubricating oil, but put on the 0W-20 lubricating oil, you will find that this sentence is not used. Similarly, we turn back to the previous standard, the 100 °C kinematic viscosity span of 0W20 is very small (similar to single-grade lubricating oil), as long as the low temperature of 3.8 is met, and the high temperature is less than 9.3. (GAC purple barrel as a benchmark of 0W20, since the thunderstorm, it can also be regarded as stepping off the altar)
This low span requirement makes it easy for manufacturers to meet the high temperature viscosity needs in the use of traditional Class 3 base oils, and the low temperature performance can be achieved according to the need to add the same low temperature performance according to the appropriate amount of Mineral Oil Adhesive.
So how do car owners think that the lubricant materials they buy are good or not?
Quite simply, look at the turbidity of the oil and guess eight or nine!
Tiger is here to teach everyone a trick!
The cloud point -37 to -50 °C is basically a lubricating oil based on Class 4 PAO base oil or Class 4+5 base oil. It belongs to the top goods, and the price can be considered within 110 yuan / L. Cloud point -20 °C to -36 °C, conventional 3 + 4 types of base oil modulation or 3 + GTL base oil, class 4 PAO content is roughly around 20-30%, the price of 60 yuan / L can also be considered. The turbidity point is less than -20 °C, this lubricating oil is a simple pure class 3 base oil, as a cost-effective running amount of lubricating oil, the price is not unusable within 40 yuan / L.
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