MIL-PRF-17331J(SH) (W/ AMENDMENT 1), PERFORMANCE SPECIFICATION, LUBRICATING OIL, STEAM TURBINE AND GEAR, MODERATE SERVICE (30 MAR 2007)., 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. The lubricating oil will be identified as follows: Military symbol NATO symbol 2190 AND TEP O-250.