What are oil passages in an engine block commonly called?

In an engine block, oil passages are commonly referred to as galleries. These galleries are specifically designed channels that allow engine oil to circulate throughout the engine, ensuring that all moving parts receive adequate lubrication. This circulation is critical for reducing friction, maintaining optimal operating temperatures, and preventing wear, ultimately contributing to the engine's efficiency and longevity.

These galleries are typically machined into the engine block and can vary in size and shape depending on the engine design. The term “galleries” specifically indicates a network set up for the distribution of oil, distinguishing it from more general terms that may not accurately describe the complexity or function of the passages. Other terms like channels or paths might imply a more straightforward or less integrated system, which wouldn't fully encompass the engineering involved in oil distribution throughout an engine.