It is more economical to change the oil after 20000 kilometers of naturally aspirated vehicles.

In the case of "running at a loss", the engine wear is relatively large, and the requirements for engine oil are relatively high. Therefore, it is suggested to shorten the oil change interval to effectively protect the engine.

Tip: At ordinary times, it is difficult for us to decide whether to change the oil by naked eyes or touch. But after long-term use, a lot of impurities will accumulate in the oil. If the oil is not changed in time, these impurities will wear the engine for a long time and shorten the life of the car.

2. How to choose engine oil when shopping?

Choosing a good engine oil can make the car more durable and more dynamic. Good engine oil, especially synthetic engine oil, can not only protect the engine, reduce the number of oil changes, but also save the cost of gasoline. Therefore, its price is twice as expensive as ordinary engine oil, which is the best choice for many car owners.

Pay attention to four elements when buying oil.

Generally speaking, the following four factors should be paid attention to when choosing automobile oil:

(1) The choice of engine oil should be based on the requirements of the engine. It is not necessary to use too high-grade engine oil on engines with lower requirements, nor can you use lower-grade engine oil on engines with higher requirements.

(2) Multi-grade oil should be selected as far as possible. Multi-grade oil has the advantages of economy, long service life and high efficiency, and has a good protective effect on the engine. Based on the characteristics of multi-grade oil, it is normal that there may be premature blackening and oil pressure reduction during use.

(3) The quality of some domestic famous brand engine oils is quite good, and the price is much lower than that of imported similar products, so you can use them with confidence, and you don't have to blindly pursue "foreign oil".

(4) If the engine is in good condition and the seasonal temperature is low, try to use low-viscosity engine oil to make the oil circuit smooth. For example, in the high temperature season or in the case of serious engine wear, choosing high viscosity engine oil is conducive to the formation of oil film and reducing engine wear.

Tip: There are hundreds of engine oil brands on the market. Choosing a better grade of engine oil, although a little expensive, will better protect engine parts.

Special oil may not be suitable for your car.

Many brand automobile factories have matching special automobile oil. Although the price is more expensive than ordinary oil, many car owners think that special oil is most suitable for their vehicles, so they insist on using this oil. However, after adding special engine oil, vehicles often have problems. Why? According to industry insiders, special automobile oil may not be suitable for your car. Automobile manufacturers themselves do not have factories specializing in the production of automobile oil. They only entrust this brand of special engine oil to a certain manufacturer according to certain standards, and do not monitor the production of engine oil. The oil standards of some internationally renowned automobile manufacturers are formulated according to the level of developed countries. In addition, adding oil to the car depends on the age of the car, the condition of the engine and the geographical situation. Of course, only a few specifications of special oil can not meet the requirements of various vehicle conditions and regional conditions.

Tip: Only by adding proper automobile oil can the vehicle be truly maintained.

3. The oil quantity should be slightly lower than the scale on the dipstick.

As we all know, engine oil is very important for the movement of the engine, because it shoulders the two functions of lubrication and heat dissipation. Therefore, at any time, there is no shortage of oil for the engine. However, excessive addition (exceeding the upper limit of the scale) has very bad consequences. Too much engine oil will increase the rotation resistance of the crankshaft and reduce the output power of the engine, and those excessive engine oil will rush into the combustion chamber to participate in combustion, which will cause the vehicle to burn engine oil, emit blue smoke and even increase fuel consumption. Residue (mainly composed of carbon and very hard) after engine oil combustion will accumulate on the combustion chamber wall, reducing the combustion chamber space, thus reducing the compression ratio of the engine. At the same time, it will also accelerate the wear of cylinders and pistons, thus reducing the service life of vehicles.

When adding lubricating oil, it is advisable to keep it slightly lower than the scale on the dipstick. In addition, we must master many factors such as engine oil model, season, climate, engine displacement and technical performance. Therefore, it is best to choose a professional automobile maintenance center, carefully judge the automobile, select the applicable engine oil, carefully operate the maintenance process, and put an end to hidden dangers. Of course, the general auto repair center will not refuel more (cost control), but if you bring your own oil, the auto repair center will not care too much, so you should be careful not to add more lubricating oil.

Tip: It is wrong to add more oil. If you find too much oil, you'd better entrust an automobile maintenance center to let it go.

Principle of selecting engine oil (original)

Poor driving skills, good oil use, good driving skills, casual;

More than 20 thousand kilometers a year, use good oil, use medium-grade oil below 10 thousand a year;

There are many cars in the city, stop and go, use oil well, and run casually in the suburbs;

Make good use of oil for waste gas pressurization, and naturally absorb oil according to the mileage of one year;

Use good oil for private cars, and good oil for buses can be wiped off for their own use;

Use good oil in places with good air quality, and change oil frequently in places with heavy dust, because dust will grind the engine, and it is not cost-effective to use good oil, so use medium-grade oil;

Thin oil can be used instead of heavy oil;

Oil with small temperature difference span can be used instead of oil with large temperature difference span.

Understand the meaning of total synthesis. Comprehensive or comprehensive is an adjective, and there must be a concrete thing behind it. It is really produced from raw base oils of PAO (poly α-olefin) and POE (ester). It is useless to talk only about total synthesis and synthesis. The total synthesis can't say anything specific, and the flicker is killed.

Two big jokes: first, high-grade cars use good oil, while low-grade cars don't use oil; Second, it is expensive to use oil wells. If you have money, use oil wells.

Generally speaking, no one in a 4S shop knows what its so-called special oil is. It is recommended to ensure that you choose the oil that suits you as soon as possible, so that you know what you are doing.

Yesterday, a cyclist's sx4 changed his beauty 1 by 2,000 kilometers, and now it's almost 5,000 kilometers. He said that the beauty 1 was changed at 3000 for the first time, and the oil needed to be changed. I checked, the oil is very good, very clean, very, very good! I had a hard time persuading, what a fool! Now novices don't want to spend money to protect the engine with good oil, or they really don't take the money properly, so they must fight for good oil. In order to squeeze out the last drop of oil, they must use it on the spot.

Several basic concepts:

Base oil: base oil produced by refineries can be divided into two categories: one is extracted from residual oil; The second is a compound synthesized from distilled gas.

Base oil: one base oil or several base oils are mixed together in lubricating oil blending equipment. Before adding additives, we usually call the oil base oil.

Additive: used to enhance or make up for the performance and deficiency of base oil in some aspects.

When we wash clothes, water is equivalent to base oil and washing powder is equivalent to additive.

The question of how many kilometers to change the oil is related to the following factors:

1, actual quality of engine oil (because different manufacturers may have different raw materials, processing technology and formula)

2. Exercise road conditions and loads

3. Working conditions of the engine

4. Principle and quality of oil filter

5. Personal driving habits

However, there is always a solution, that is, the rapid detection method of reused oil.

Checking engine oil is an important part of daily vehicle inspection. Besides observing quantity, inspection is more important. In addition to observing its quantity, it is more important to inspect its quality to see if it has the main performance of normal continuous use, so as to decide whether to replace it.