After cleaning the throttle, change the oil ~ change the spark plug. Is it normal for the car to run 30 yards without gas?

First of all, when should I change the oil?

Under normal driving conditions, if a new car uses synthetic engine oil, the oil can be changed basically every 1000 km, and some cars can even be dragged for 20,000 km. Automobile maintenance professionals believe that "general driving" means driving on the expressway frequently and rarely stopping. But if you often drive in the city and there are traffic lights everywhere, traffic jams are common, and the distance of each trip is mostly within ten kilometers. This kind of driving mode belongs to "wasteful driving".

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: It is usually difficult to decide whether to change the oil with 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.

Second, how to choose engine oil when purchasing

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.

Generally speaking, the following four factors should be paid attention to when selecting engine oil:

1, the choice of engine oil should be based on the requirements of the engine. An engine with lower requirements does not have to use too high-grade engine oil, and an engine with higher requirements cannot use lower-grade engine oil.

2. Multi-grade oil should be selected as much 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. There is no need 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.

Third, the amount of oil is slightly lower than the scale on the dipstick. Don't pack it too full.

Engine oil is very important for engine operation, because it shoulders two major 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.