A common symptom of insufficient lubrication would be?

A common symptom of insufficient lubrication is loud operational noise. When there is inadequate lubrication in machinery or engine components, metal parts can grind against each other without the protective film of oil, leading to increased friction. This friction generates noise that is often described as grinding, knocking, or other unusual sounds that indicate a problem.

The presence of loud operational noise serves as an alert that components are not receiving enough oil to function smoothly, which could lead to severe wear and potential failure if not addressed. Observing this symptom should prompt immediate investigation and action to assess and rectify the lubrication system's effectiveness.

In contrast, smaller oil reservoirs and increased engine speed do not directly indicate insufficient lubrication, while oil clarity relates to the condition of the oil itself. If oil is contaminated or degraded, this might affect lubrication quality but isn't a direct symptom of insufficient lubrication related to operational noise.