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Should the Crankshaft Oil Seal Be Replaced if It's Leaking?

1 Answers

VanDominic

07/30/25 8:14am

Crankshaft oil seal leakage should be replaced. If you notice severe engine oil leakage from the rear crankshaft oil seal while driving, the emergency measure is to add some engine oil to the crankcase and then drive the car to the nearest repair station as soon as possible for inspection. A better solution is to call a tow truck to take the car to an authorized 4S shop for repair. Reasons for rear crankshaft oil seal leakage: 1. Non-petroleum-based lubricants were not used during the installation of the crankshaft oil seal, or low-quality oil seals were used, causing the oil seal to loosen or even fall off after some time of engine use, leading to oil leakage from the rear crankshaft oil seal. In severe cases, oil may drip; 2. The parallelism of the rear oil seal mounting surface relative to the rear oil seal seat did not meet technical requirements, resulting in uneven force distribution on the oil seal lip. Over time, this can cause the oil seal to deform, twist, or age, leading to oil seal damage and engine oil leakage; 3. Prolonged use, high temperatures, or uneven force distribution can cause the rear crankshaft oil seal to age and leak oil. Severe leakage can result in insufficient engine sealing, failing to achieve the necessary lubrication effect.

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