Which measure is vital after an engine overhaul to ensure longevity?

The crucial measure to ensure the longevity of an engine after an overhaul is maintaining proper oil change intervals. After an engine overhaul, the internal components, such as bearings and cylinders, may still be settling and optimizing their operation. Fresh oil is essential because it lubricates these components, minimizes wear and tear, and helps prevent the buildup of contaminants.

The engine requires clean oil to effectively capture debris and metal particles that may have accumulated from the rebuilding process or from normal wear. By adhering to the recommended oil change intervals, you can ensure that the engine receives the adequate lubrication it needs, thereby enhancing its performance and extending its life.

While other options may seem beneficial in different contexts, they do not provide the foundational support for long-term engine health that proper oil change intervals do. High RPM usage could lead to excessive wear during the initial break-in period, operating under heavy loads might stress the engine before it has settled in, and visual inspections, while important for identifying potential issues, do not directly contribute to the fundamental lubrication and cleanliness of the engine.