How to judge whether the automobile gearbox oil needs to be replaced? In fact, this is not only difficult for ordinary car owners, but also difficult for some high-end maintenance technicians to make simple judgments. Moreover, many manufacturers also claim that "the gearbox is maintenance-free for life" to mislead the owner, because the gearbox oil does not need to be changed, which will lead to serious gearbox failure.
Generally speaking, the oil change cycle of gearbox is about 60 thousand kilometers. If you often drive in the urban area and start braking repeatedly, the gearbox will always be in a heavy load state when starting, and the oil temperature of the gearbox will rise. This operating state should be changed in advance. If you often drive at an economical speed in third-and fourth-tier cities, and the gearbox works well.
Then it is not a big problem to delay the replacement to 85438+ 10,000. If you are not sure, please follow the manufacturer's requirements. After all, the oil change cycle of automatic transmission is relatively long. Perhaps the number of times a car is scrapped and the transmission oil is changed can be counted by most car users with one hand. I just want to save money, not waste it.
However, we often waste time worrying about the delay of oil change. Some car owners waste time checking all kinds of information every day to find evidence that can delay oil change. Some car owners try their best to delay the time. If they drive late and the gearbox is slightly abnormal, they immediately worry that the gearbox oil will not work, and they drive nervously every day, wasting energy.
Therefore, we don't need to spend too much energy on this. Both Japanese and Korean models have transmission dipstick for our own inspection. When the car is hot, the water temperature reaches 90 degrees, then hang all gears, and then pull the dipstick to check the oil. The oil level is best in the middle of the two scales on the dipstick.
For American and German cars without gearbox dipstick, it is necessary to remove the oil level screw in the gearbox for inspection. At this time, it is necessary to go to the repair shop for shunting, then remove the oil level, and then the gearbox oil flowing out of the oil level screw can drip out.
No matter how you check the oil level, you can remove some transmission oil during the inspection. Don't change the oil unless it looks clean and has no metal residue. The working environment and function of gearbox oil and engine oil are different, and the degradation of gearbox oil is much slower, but there is little difference in viscosity between them.
Some additives are added to the gearbox oil, such as antioxidants to prevent the gearbox oil from being oxidized at high temperature, and dispersants to prevent deposits in the gearbox. These additives make the gearbox oil basically equal to the service life of the gearbox, and there is a filter inside the gearbox, which can also filter out metal residues.
Therefore, some manufacturers say that gearbox oil is maintenance-free for life. It is exaggerated to say that the automatic gearbox without changing oil is BMW's, and BMW's gearbox is provided by ZF, but the automatic gearbox without changing oil is not a patent of ZF, but a function provided by BMW.
Simply put, ZF, as a transmission manufacturer and supplier, has no ability to degrease products; In fact, there are many ZF gearbox brands, such as Alfa Romeo. For example, these brands have no suggestions for free oil change. Therefore, the statement that BMW changes hydraulic oil for free can be understood as a longer service life!
As for the replacement process, the automatic gearbox will generally feel bumpy when it is in gear, so riders should not hesitate. Only when the vehicle is in good condition can it provide you with a safe and normal driving environment.