What are the causes of transmission oil leakage in cars?
2 Answers
The causes of transmission oil leakage in cars are: aging of seals. Over time, seals harden and lose plasticizers, a process accelerated by continuous thermal cycling. The seals first shrink, then harden, and eventually crack, making oil leakage an inevitable phenomenon in transmissions. Methods to check for transmission oil leakage: Look down at the rear underside of the car to observe if there's any leakage at the transmission bottom. Oil at the bottom will accumulate dust, leaving a black oily stain. For minor leaks, check the transmission housing for any oil stains. A car transmission is a mechanical or hydraulic device that converts mechanical power.
I have some experience in car repair. Common transmission oil leaks are often due to seal issues, such as aging, hardening, or damage to the oil pan gasket. Prolonged driving with high temperatures and vibrations can easily cause leaks. Then there's the output shaft oil seal—if it's worn or not installed securely, oil can drip through the gaps. Sometimes, bolts aren't tightened properly during oil changes, and loosening can lead to slow seepage. Neglecting such small issues can lead to major problems. Another cause could be cracks in the transmission housing, possibly from collision damage. I recommend regularly checking under the car for oil stains and addressing any leaks immediately to avoid running out of oil and damaging the transmission, which can be costly to repair. Early detection and action save both money and hassle.
