What are the effects of overfilling transmission fluid?

2 Answers
Penny
09/04/25 6:12am
The effects of overfilling transmission fluid include: 1. High oil pressure, which can cause oil seals to leak; 2. Increased resistance in internal gears; 3. Poor lubrication of the transmission, leading to reduced lifespan; 4. Transmission slippage; 5. Slow acceleration and incomplete combustion. Transmission fluid should be replaced every 4 years or approximately 60,000 to 80,000 kilometers. The method for replacing transmission fluid is: 1. Remove the transmission guard plate, loosen the screws on the oil pan, and drain the old transmission fluid; 2. Unscrew the screws on the oil pan and remove the oil pan; 3. Apply sealant to the new oil pan and tighten the screws; 4. Loosen the screws on the left side of the transmission to add new fluid.
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StSabrina
09/16/25 7:08am
Overfilling transmission fluid can cause serious issues. Last time I didn't measure properly after topping up, and within just a few kilometers I noticed abnormal transmission noises - sounded like bubbling inside. Excess fluid increases pressure, which can damage oil seals and gaskets, leading to leaks that contaminate other components. Even worse, the fluid foams up, reducing lubrication effectiveness. Gears and bearings wear out rapidly, potentially requiring major repairs soon. The foam also causes transmission overheating, accelerating wear and making gear shifts rough and unresponsive. I immediately went to a repair shop to drain the excess. The technician warned that repeated overfilling could permanently damage the transmission. Now I always use precise measuring tools to ensure fluid levels stay within specifications, and regular checks have become crucial.
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