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What Are the Causes of Manual Transmission Oil Leaks?

2 Answers

AmirDella

07/29/25 1:06am

Manual transmission oil leaks are caused by: 1. Aging and deformation of oil seals. The side of the oil seal with the spring ring should face the oil side. If the oil seal does not fit tightly, it will cause oil leakage; 2. Damage to the oil lines, causing oil to leak from the damaged area during circulation; 3. Loose transmission cover screws or damage to the mating surface of the transmission case can also lead to oil leaks. A manual transmission is a gearbox used to change the speed and torque transmitted from the engine to the drive wheels, enabling the vehicle to achieve different traction and speed under various conditions such as starting from a standstill, climbing hills, turning corners, and accelerating. When operating a manual transmission, the clutch must be depressed to shift the gear lever.

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VonKira

08/12/25 5:16am

As a veteran driver with over 20 years of manual transmission experience, I've found that transmission oil leaks are mostly caused by aging rubber seals. After prolonged use, high temperatures harden and crack the seals, allowing oil to seep through the gaps. Then there's the drain plug - if it's not tightened properly or the washer is damaged, oil will drip out. I remember last winter when my car's seals contracted in the cold, oil leaked everywhere. More troublesome is when the input or output shaft oil seals wear out - just a few drives on bumpy roads can wear them through. I recommend checking transmission fluid levels periodically and replacing any leaking seals immediately. Otherwise, low oil levels accelerate gear wear, leading to costlier repairs. Regular maintenance saves a lot of headaches.

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