Which MIL-PRF is associated with engine oil?

The correct association for engine oil is MIL-PRF-23699. This specification pertains specifically to low-temperature engine oils, which are typically used in military aircraft engines. MIL-PRF-23699 outlines the performance requirements that these oils must meet to ensure efficient engine operation, particularly under extreme conditions faced during military operations.

Different MIL-PRF numbers correspond to different types of fluids or requirements; for instance, MIL-PRF-83282 relates to hydraulic fluids, and MIL-PRF-85733 and MIL-PRF-85734 refer to specifications for various types of grease or lubricants used in different applications. Each specification is tailored for specific functions and environments to ensure compatibility and performance, highlighting the importance of using the correct fluid for particular systems or components.