If the engine is the "heart" of the car，So，The gearbox can be said to be the "brain" of the car，is one of the important components of the car，When the car is driving for a certain time or after mileage，Auto transmission oil needs to be replaced regularly。

The gearbox oil can play a role in ensuring the normal operation of the gearbox and extend the life of the transmission device，Generally changing every 5-80,000 kilometers，Specific car owners can query through the Ledong online maintenance manual

There are many hydraulic valves and various small oil pipes in the inside of the gearbox，Compared to changing oil，It is more complicated to replace the gearbox oil。There are usually two ways to replace gearbox oil: one is gravity change oil，Another is to use automatic circulating machine loop replacement，So what is the difference between the two ways to replace the automatic transmission oil? Which one is better

1. Gravity exchange oil

Gravity seabet mychanging oil is better understanding，It is the oil screw of the oil base of the gearbox oil bottom by unscrewing the gearbox，Let the gearbox exhaust gas flow out of gravity，Add new transmission oil

but but，Traditional gravity oil changes usually have more old gearbox oil，Especially for automatic transmission oil。This has a direct relationship with its internal complex design structure，Generally common automatic transmission inside at least 6-8L automatic transmission oil。Where，The liquid coupling of the valve body module occupies about 50%of the total oil，There are also some automatic transmission oil bottom shell shape design reasons will also occupy a part of the transmission oil。

If you want to further reduce the amount of storage residues of the old oil，You can unscrew the screws around the oil bottom shell，Get off the oil bottom shell，Clean the oil bottom shell。

Summary:

Advantages of gravity oil replacement: simple operation，less oil，Relatively speaking, saving money。

Disadvantages of gravity oil replacement: The amount of old oil deposits is relatively large，After adding new oil, it will lead to mixing new and old oil，Reduce the maintenance cycle of the gearbox。

2 loop replacement

The use of a circulating machine to change oil has only become popular in China in recent years，Simply put，It is the oil inside the gearbox out of the gearbox through the principle of "post -wave push forward"。

Usually screwed the oil screws for oil (about 3L of old oil)，Then open the oil bottom shell screw and continue to release the old oil (release about 1L of old oil)，and clean the oil bottom shell。

Wash the oil bottom shell and seabet appinstall a new automatic transmission filter element，After replacement, install the oil bottom shell to connect to the looper，Replace the automatic transmission oil，The vehicle needs to be started during the recycling process of the circulating machine。The vehicle needs to be started during the recycling process of the circulating machine，Old oil is pushed out by pressure。

During the circular machine replacement process，You can clearly see the alternation of new and old oil through the window and window，until the color of the old oil is consistent。

Circular machines can generally replace more than 80%old oil，But it will spend 4-5L new oil，The price of the two may be hundreds to thousands of yuan。

Summary:

The advantages of loop replacement: Old gearbox oil residue is small，The secondary pollution of the new oil is not serious，Always allow the gearbox to work in a good working environment，Appropriate extended transmission oil maintenance cycle。

Disadvantages of cycle replacement: Complex operating process，Alternative oil with oil，The price is more expensive

Summary

From a technical perspective，Use a circular machine to replace the car gearbox oil than traditional gravity replacement，Make up for the shortcomings and deficiencies of gravity changing oil。

Although the advantages of replacing the gearbox oil with a circulating machine are used，But generally only 4S shops are equipped with a circulating machine，Small roadside auto repair shops usually have no。If you feel that every time you change the oil, you must clean up，So you can use a circular machine，If you think it doesn't matter，So you seabet appcan also use the traditional gravity method