What is true about scavenged oil?

Scavenged oil is part of the lubrication system in many aircraft engines, including the T-6B. When the engine operates, it generates heat and friction, which can lead to the degradation of the oil. Scavenged oil is the oil that has already circulated through the engine and has collected contaminants and heat. Its routing through an oil cooler before returning to the main oil tank is essential for maintaining optimal operating temperatures and oil quality.

By passing through the oil cooler, the scavenged oil is cooled before re-entering the main tank, helping to ensure that the lubrication system can effectively manage the engine's thermal demands. This process helps to maintain engine performance and prevent overheating, which can lead to engine damage. The oil cooler plays a critical role in enhancing the longevity and reliability of the lubrication system by ensuring that the oil remains within a desirable temperature range.

While oil is indeed filtered and can originate from various parts of the engine, the specific role of the scavenged oil involves its cooling and conditioning as it returns to the tank, which makes the routing through an oil cooler a necessary and accurate statement.