Is It a Big Problem to Overfill Transmission Fluid by Half a Liter?

1 Answers
StDelilah
07/30/25 9:37am
Overfilling transmission fluid can cause the fluid to foam, allowing air to mix into the fluid passages and reach the clutch. When shifting into D gear, the presence of air between the clutch plates prevents them from pressing tightly together, leading to clutch slippage, difficulty in moving the vehicle, and accelerated clutch wear. Hazards of not changing transmission fluid: 1. Damage to the transmission's shift control mechanism; 2. Abnormal wear of gears and clutch plates inside the transmission; 3. Affects the normal operation of the transmission, leading to damage of the transmission valve body. Transmission fluid and engine oil are not the same. Although both serve a lubricating purpose, they perform different functions and should not be confused. Difference: Engine oil is the lubricant for the engine system, possessing certain properties like oxidation resistance, wear resistance, and corrosion prevention. Transmission fluid, on the other hand, is mainly used to keep the gear system clean and can extend the service life of internal transmission components. Because the structure and operating environment of the transmission and engine are different, transmission fluid cannot be used as engine oil, nor can engine oil be used as transmission fluid.
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