What are the symptoms of excessive automatic transmission fluid?
2 Answers
Automatic transmission fluid excessive symptoms: 1. Poor transmission lubrication, shortened lifespan; 2. Transmission slipping and gear shifting impact; 3. Transmission may suffer severe damage or even be scrapped. Transmission fluid is an oil product that maintains the cleanliness of the gear system, ensuring the normal operation of the transmission and extending the life of the transmission device. The main functions of transmission fluid are lubrication and cooling, dissipating heat through the transmission housing and transmission radiator. If too much oil is added, the gear rotation will encounter greater resistance, reducing the transmission's cooling efficiency and power transmission efficiency. This requires the engine to consume more fuel, leading to a decrease in the vehicle's fuel economy. Moreover, this part of energy loss will be converted into heat inside the transmission.
I once experienced a situation where the transmission fluid was overfilled. At that time, while driving, I noticed that gear shifting was particularly rough, with noticeable jerks—it felt like being shoved every time I started moving. Later, the dashboard even lit up with a temperature warning light because the excess fluid caused the transmission to overheat, affecting its cooling. Another time, a mechanic pointed out to me that the fluid had overflowed near the seal, resulting in a messy oil leak all over the chassis. The noise was also louder; I could constantly hear a buzzing sound while driving, like bees humming. The most annoying part was the increased fuel consumption—it jumped from around 7 liters per 100 km to 9. Later, at the dealership, they explained that overfilling raises internal pressure, accelerating part wear. A minor case might just require a fluid change, but a severe one could mean transmission repairs. So, I recommend checking the dipstick every 5,000 km—don’t wait for problems to fix them. Safety first!