In lubrication terms, 'flushing a system' is aimed primarily at:

Flushing a system in lubrication terms primarily serves to clear out contaminants, and this is crucial for maintaining the longevity and performance of machinery. Over time, lubricants can accumulate debris, dirt, and other contaminants that can hinder the effectiveness of the lubrication system. By flushing, you ensure that these unwanted materials are removed, allowing for optimal flow and function of the lubricant.

When contaminants are left in the system, they can lead to increased wear and tear on components, potential blockages, and overheating. Flushing helps to prevent these issues by providing a clean slate for the lubricant to work effectively. Following a thorough flushing process, new lubricant can be introduced to replace what was removed, further enhancing the system's performance.

While removing excess lubrication or introducing new lubricants can be part of maintenance tasks, the primary focus during the flushing process is on cleaning out contaminants that could otherwise compromise lubrication efficiency and machinery function. Testing oil pressure, although important, does not directly relate to the primary function of flushing in the context of maintaining a clean and effective lubrication system.