How often should the gear oil in a sedan be changed?

[IsabelFitz]

Sedan gear oil should be changed every 60,000 kilometers to effectively improve the efficiency of gear transmission of engine power. When changing the oil, viscosity selection is a fundamental factor in choosing gear oil. If the viscosity is too high, it can cause overheating of the friction surfaces and unnecessary power loss. If the viscosity is too low, centrifugal force may cause the oil to be thrown off the gear surfaces, leading to oil seal leakage. To prevent gear surface scuffing, peeling, or sintering caused by high pressure during gear contact, it is essential to choose gear oil with excellent anti-wear and extreme pressure performance to maintain proper load-bearing capacity. Therefore, when selecting oil products, car owners must avoid adding other oils such as internal combustion engine oil or hydraulic oil into the gearbox, as this may result in insufficient extreme pressure and anti-wear performance, damaging the gears.