After the car is bought home, the most important job is to maintain the car, and the most important thing in maintenance is to change the engine oil. If the engine is likened to the heart of a car, this oil is the blood of our car, and it should not be sloppy.
Therefore, whether we change the oil to the 4S shop, find the repair shop master or do it yourself, it is necessary to understand some knowledge about the oil and some misunderstanding about the oil.
What is the oil used for ?
We all know that it is to lubricate the engine to prevent the friction between the metals in the engine from damaging the engine. In addition, the engine can be cooled, anti-corrosion, anti-corrosion, sealed to prevent leakage, and shock absorbing buffer, in short, to protect the engine.
We change the oil in the 4S shop, they are all bought by the barrel. After the maintenance, there will usually be a small half barrel. Some people think that it is not necessary to take it back. I don’t know where to put it when I go back. I don’t know how to save it. So I directly I gave it to the 4S shop. This is not the time when we show our local tyrants. Add the remaining oil and pack it back. Because some cars will be found after a month or two, the engine oil is less, and the remaining oil can be used. Add it up.
In addition, there is also a use, that is, every time we do maintenance and change of oil, it is difficult to put the oil clean once, we can accumulate a few times of oil, use the oil to smash the engine before the next oil change. This will make it easier to wash out the old oil.
Some of our friends often have half a barrel of oil in the trunk, because there will be some loss in the use of the oil, there will be some performance degradation, often check the amount of oil, and replenish the oil at any time.
However, this way of adding oil without changing the oil is only to make the oil reach a standard usage. However, the performance of the oil is not completely normal. In other words, it is added to the oil that has been used for a while. The new oil does not allow the oil to return to performance, just like pouring water into warm water, it is impossible to reach the temperature of boiling water, the same reason.
This is the second misunderstanding. It is not enough to only add oil instead of changing the oil. Some car oil loss is relatively large, supplemental oil can only be used as a short-term way to maintain the engine. After the oil life cycle, it is necessary to replace all the oil and add new oil.
Misunderstanding 3: In addition to adding new engine oil to the old engine oil, it can not be restored to performance. Oil from two different brands cannot be mixed. Our oil is actually adding different additives to the base oil. The base oil is the same, but the variety and quantity of the additives produce different oil types and grades. If different oils are mixed together, these additives are likely to undergo a chemical reaction that destroys the original properties of the oil and, therefore, cannot be mixed.
Misunderstanding 4: Let's say that a wrong mix is ​​to add the oil of a gasoline car to a diesel car. Our gasoline engine is ignited and burned, and the diesel engine is compressed and burned. Think about the firecrackers we played when we were young, some will explode when we use a lighter, and some don’t need to be, and it will explode when it hits the wall. The turkey that fell to the wall is like a diesel engine, which compresses the air to the ignition point. Therefore, the compression ratio of the diesel engine is at least twice as large as that of the gasoline engine. Therefore, the diesel engine requires higher oil performance, and the gasoline engine oil is used instead. Will hurt the diesel engine.
Myth 5: The time for changing oil is generally based on the number of kilometers and time. We listen to the old driver and read the manual. Generally, we will give us a suggested value. For example, ordinary mineral oil is 5000 kilometers or Changed in half a year, the semi-synthetic motor oil was changed to 7,500 km, and the fully synthetic engine oil was changed to 10,000 km. There is nothing wrong with this standard, but it depends on the actual road conditions. For example, if we add a bucket and still have 3 months to exceed its effective period of oil, even if it does not reach these kilometers, it should be replaced.
If some areas in the south are hot all year round, some big cities have serious traffic jams, serious air pollution, and a lot of wind and sand weather. It can also be replaced in advance on the basis of this kilometer standard.
But on the other hand, if our local air is very good, and we have less driving, we have already opened 3,000 kilometers in half a year, then I can not change it, certainly not, time is up, but also change Because, like the performance of mineral oil in half a year, the performance will be rapidly degraded over half a year, affecting the lubrication effect of the engine.
Misunderstanding 6: Your oil must be a good engine oil. Is imported oil better than domestic oil? We have some money, even those who are willing to spend money on car maintenance, change the oil, this is also a misunderstanding. .
Because most foreign imported oils have lower viscosity than domestically produced oils, many of our domestically produced engine parts have large gaps. After thermal expansion, more viscous oil is needed to ensure normal engine operation. Although foreign oil is expensive, it may not be suitable for such an engine, but it will increase the wear engine.
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