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What is the reason for oil leakage between the engine and transmission?

2 Answers

OCayden

07/23/25 8:09pm

Oil leakage between the engine and transmission is caused by the aging of rubber components, leading to poor sealing. Here are some relevant extended details: 1. Transmission oil leakage: The transmission, like the engine, is a very precise component, so transmission oil seepage needs to be taken seriously. Otherwise, the transmission may burn out or fail due to insufficient transmission oil. The main functions of transmission oil are lubrication, cleaning, cooling, and acting as a hydraulic medium. 2. Treatment: If transmission oil seepage is found, it is necessary to promptly go to a 4S shop or repair shop to check where the seepage is occurring. Timely treatment is the best option. However, most cases of oil seepage occur in relatively internal components, and repairing them may require removing the engine or transmission. In such cases, it can be temporarily ignored, but regular checks and adding transmission oil are necessary.

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LeSophia

08/10/25 6:06pm

My old car had the same issue. Crawled under the car and saw a greasy mess between the engine and transmission - most likely the rear crankshaft seal had aged. Rubber components start hardening and cracking after 7-8 years, letting engine oil seep through the gaps. Alternatively, it could be the transmission input shaft seal failing, with gear oil leaking out and mixing with dust to form a sticky paste. For manual transmissions, excessive leakage can cause clutch slippage and make gear shifting difficult. The worst is when the release bearing gets soaked in oil, making that awful squeaking noise when depressing the clutch. Don't ignore it - get the leak checked ASAP. Replacing small seals now beats the heartache of a full transmission overhaul later.

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