What are the consequences of not changing transmission fluid for a long time?
2 Answers
The consequences of not changing transmission fluid for a long time include thinning of the gearbox lubricant viscosity, leading to decreased cooling performance and anti-oxidation properties. Here are the relevant details: 1. Lubricant viscosity: Prolonged use causes the gearbox lubricant viscosity to thin, resulting in reduced lubrication performance, decreased sealing capability, increased resistance and wear, unstable pressure, affecting the precision of hydraulic system operation, reduced transmission control accuracy, and impaired shifting precision, smoothness, and response speed. 2. Performance degradation: Deteriorated fluid has reduced cooling performance and anti-oxidation properties, making it prone to issues like high oil temperature, creating a vicious cycle that further shortens the lifespan of both the oil and transmission components.
From my decades of driving experience, failing to change transmission oil on time can indeed cause major trouble. Over time, the oil deteriorates and gets dirty, losing its ability to lubricate the gears inside the transmission. The result is increasingly severe friction between components and rapid temperature rise. I've seen many vehicles damaged this way, leading to rough shifting or even complete breakdowns. This not only worsens the driving experience—like loud tractor-like noises during acceleration—but may also require major transmission repairs or a full replacement, with costs ranging from thousands to tens of thousands. Regular oil changes cost little but prevent these headaches. My current car gets its transmission oil changed every 60,000 kilometers, and it runs much smoother as a result.
