Can I not change the gearbox oil in 8 years?

I believe we all know that vehicle maintenance is focused on replacing the engine oil, but the replacement cycle of transmission oil and other oils has a large span, so how often can the transmission oil be changed?Can I not change the gearbox oil for 8 years?

At present, the gearboxes on automobiles can be roughly divided into two types: manual gearboxes and automatic gearboxes.

Manual gearbox

Gear oil is added to the manual transmission. The main function of the gear oil is to provide good lubrication for the gears and to clean the metal debris generated by gear wear to ensure the healthy and stable operation of the gearbox.

automatic transmission

The automatic transmission uses a special automatic transmission fluid (ATF). In addition to the role of lubrication and cleaning, the automatic transmission oil also plays a role in transmitting the engine power in the hydraulic torque converter.

Regardless of whether it is the gear oil of the manual transmission or the ATF of the automatic transmission, it is recommended to change it once every 40,000 kilometers. If the gearbox oil has not been changed for 8 years, it is very easy to cause the gearbox's gears to ablate and deform due to the dirty and bad lubrication of the gearbox; the automatic gearbox will also affect the power transmission of the engine. The maintenance cost of the gearbox is very high. Don't lose a lot because of the maintenance fee.