What is the function of the T-54A oil system?

The function of the T-54A oil system primarily involves cooling and lubricating the engine. This system is crucial for maintaining optimal engine performance by ensuring that moving parts are adequately lubricated to reduce friction and wear. Additionally, the oil system helps dissipate heat generated by the engine during operation. By effectively cooling the engine and providing lubrication, it enhances both the efficiency and longevity of the engine, enabling reliable performance in various operational conditions. This dual role of cooling and lubricating is essential for the overall functionality and reliability of the T-54A.

The other provided options do not align with the primary functions of the oil system; for example, while cooling the hydraulic system and sustaining engine power are important aspects of vehicle operation, they are not direct responsibilities of the oil system. Similarly, running the landing gear system is unrelated, as that system typically relies on different components and mechanisms.