MIL-PRF-7808 Revision L, May 2, 1997
LUBRICATING OIL, AIRCRAFT TURBINE ENGINE, SYNTHETIC BASE
The lubricating oil is intended for use in specific models of aircraft turbine engines, helicopter transmissions, accessory and auxiliary power units, and other types of equipment which require a synthetic base oil. Grade 3 is intended for normal use unless otherwise specified. Grade 4 is intended for applications which require higher viscosity and greater thermal stability.