Nyco Turbonycoil 600 is a 2nd Generation turbine oil that was approved under MIL-PRF-23699 in 1985.  All MIL-PRF-23699 approved jet turbine engine oils are based on POEs and most contain TCP.  I recall that there was one approved formulation that contained a slightly different phosphate ester additive instead of TCP but I do not recall which one.  The formulations differ mostly in the anti-oxidants and yellow metal corrosion inhibitors used.  The specifications are so tight that there is not a l
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