What type of maintenance notifications include an oil sample?

The type of maintenance notification that includes an oil sample is O1. This notification type is specifically related to operational readiness and involves maintaining and monitoring the condition of the vehicle or equipment's oil. An oil sample provides crucial data that assists in diagnosing potential mechanical issues before they lead to severe equipment failure, thereby ensuring the operational capability of military assets.

In contrast, the other maintenance notifications, such as HS, D1, and M1, pertain to different aspects of maintenance processes, which do not emphasize the collection and analysis of oil samples for the purpose of monitoring the health of the equipment. Understanding the significance of oil samples in maintenance helps in identifying potential issues early and implementing corrective actions effectively.