MIL-PRF-17331J, PERFORMANCE SPECIFICATION, LUBRICATING OIL, STEAM TURBINE AND GEAR, MODERATE SERVICE (9 SEP 2003) [SUPERSEDING MIL-L-17331G]., This specification covers a single classification of steam turbine and gear lubricating oil, moderate service, for use in main and auxiliary turbines and gears, air compressors, and certain hydraulic equipment, as well as for general mechanical lubrication.