During which maintenance activity is the condition of oil levels primarily assessed?

The condition of oil levels is primarily assessed during post-operation checks. After the engine has been running, checking the oil levels is crucial to ensure that there is adequate lubrication for the engine components, and to identify any potential leaks or oil consumption issues that may need to be addressed. This step helps confirm that the oil is at the appropriate level for optimal engine performance and longevity.

While initial engine assembly and long-term storage preparation involve oil considerations, those activities focus more on installation or preparation rather than routine assessment of oil levels. Pre-operation testing also deals with engine readiness but does not typically include a detailed inspection of oil levels, as that is best performed after operations have concluded. Post-operation checks are specifically designed to provide insights into the engine's condition after it has been in use, making it the best context for evaluating oil levels effectively.