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I've designed a lot of aircraft systems that use MIL-H-5606 (or MIL-PRF-5606H). It's often called "red fluid" in aviation. I've used it a lot. It's pretty good stuff. It shouldn't be hard to find at all.
http://www.aircraftspruce.com/catalog/lgpages/phillips66XC5606H.php?clickkey=43943...