What causes oil leakage at the connection between the engine and transmission?

[SanSara]

There are two possible causes: either the front transmission seal or the rear crankshaft seal is leaking, or both may be leaking. Below is relevant information about transmissions: 1. Main functions: Changing the transmission ratio to expand the range of torque and speed variations at the drive wheels, adapting to frequently changing driving conditions while keeping the engine operating under favorable conditions. Enabling the vehicle to reverse while maintaining the engine's rotational direction. Utilizing neutral gear to interrupt power transmission, allowing the engine to start, shift gears, and facilitating gear changes or power output. 2. Working principles: Manual transmissions primarily consist of gears and shafts, achieving speed and torque variations through different gear combinations. Automatic transmissions (AT) are composed of torque converters, planetary gears, and hydraulic control systems, achieving speed and torque variations through hydraulic power transmission and gear combinations.