What are the effects of not changing transmission fluid for a long time?

[VonMary]

The effects of not changing transmission fluid for a long time are: the viscosity of the transmission fluid will become thinner after prolonged use, leading to decreased lubrication performance, reduced sealing performance, increased resistance, and increased wear, resulting in unstable pressure, affecting the working accuracy of the hydraulic system, reduced transmission control accuracy, and lower shift precision. Both smoothness and response speed will be affected. The cooling performance and anti-oxidation performance of deteriorated transmission fluid decline, making it prone to issues such as excessively high oil temperature, creating a vicious cycle that further shortens the lifespan of the fluid and transmission components. Therefore, vehicles that never change transmission fluid are highly likely to experience difficulties in shifting up or down, frequent gear jumping, and noticeable gear engagement impacts.