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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...