What system is responsible for returning oil to the oil tank?

The scavenge system is specifically designed to return oil to the oil tank after it has circulated through the engine or machinery. In many systems, the lubrication process involves distributing oil to various components to reduce friction and wear. Once the oil has served its purpose, it needs to be collected and sent back to the oil tank for reconditioning or reuse. The scavenge system plays a critical role in ensuring that the oil is effectively collected from different areas and returned to the reservoir without leaving any excess oil in the mechanism, which can lead to inefficiencies or potential damage.

The lubrication system, while also vital, encompasses a broader function that includes distributing oil, monitoring oil levels, and ensuring that all necessary areas are adequately lubricated. On the other hand, the oil cooling system focuses on regulating the temperature of the oil to maintain optimal performance, and the recirculating pump is a component that aids in moving oil, but it is not solely responsible for the return to the tank. Understanding the distinct functions of these systems clarifies why the scavenge system is the correct answer in the context of returning oil to the oil tank.