The MIL number returns as DTE Heavy-Medium, MIL-L-17331 (2190 TEP). A search on that from Mobil and I found this...
Mobil DTE Named Series Mobil DTE Heavy Medium
ISO Viscosity Grade 68
Viscosity, ASTM D 445
cSt @ 40º C 65.1
cSt @ 100º C 8.7
Viscosity Index, ASTM D 2270 95
Pour Point, ºC, ASTM D 97 -15
Flash Point, ºC, ASTM D 92 223
Density @15º C kg/l, ASTM D 4052 0.87
TOST, ASTM D 943, Hours to 2 NN 3500
FZG Scuffing, D5182, Fail Stage 10
Rust Prevention, ASTM D 665:
Distilled Water Pass
Sea Water Pass
Water Seperability, ASTM D 1401,Min. to 3 ml emulsion @ 54ºC 20
Copper Strip Corrosion, ASTM D 130,3 hrs @ 121º C 1B
Foam Test, ASTM D 892, Seq I Tendency/stability, ml/ml 50/0
Air Release, ASTM D 3427, 50º C, min. 4
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Cheers
Poccur