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What Causes Oil Leakage After Changing Transmission Fluid?

2 Answers

LaTaylor

07/24/25 10:53am

Transmission is a crucial component of a vehicle's drivetrain system. It not only transmits power but also serves functions such as lubrication, cleaning, cooling, rust prevention, and sealing. Oil leakage can lead to insufficient lubrication, accelerating gear friction. Possible reasons for transmission oil leakage include: 1. Loose screws: Damaged or improperly installed gaskets can cause oil leakage around the valve cover, requiring timely tightening of the screws. 2. Front and rear crankshaft oil seal leakage: Oil seepage due to improper installation of the oil seal. 3. Improper installation: Oil leakage at the lubricating oil filter, pressure relief valve, or sensor due to improper installation; replace the gasket and reinstall. 4. Loose bolts or cracks/holes in the oil pan: These can also cause engine oil leakage. 5. Loose, broken, or poorly fitted oil pipes: Damaged gaskets at the connection between the fuel pump and cylinder block can cause oil leakage.

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DeAlana

08/11/25 5:54am

I've dealt with many similar cases before. Transmission fluid leaks after an oil change are mostly due to installation errors. If the drain plug or fill bolt isn't tightened properly, fluid can seep through the threads. Using old or damaged sealing gaskets won't contain the fluid. Improper application of sealant after removing the oil pan or misaligned filter placement can also cause leaks. Another detail is overfilling beyond the max line - excessive pressure during operation can rupture seals. The original oil seal might already be worn, and a slight push during service could completely crack it. This needs immediate attention; I've seen cases where delayed repairs led to complete fluid loss and transmission damage. First, wipe the undercarriage to locate the leak and try tightening the bolts. If that doesn't work, return to the shop immediately for new gaskets. Next service, insist on new components and careful installation.

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