Originally Posted By: OVERK1LL
How do they get GIII to pour at -66C ? That's lower than PAO territory IIRC, and even POE.
Begging the question: are we really talking about a G-III oil. I have come to realize that there are really few, if any, remaining pure "base x" oils out there any more, and that virtually all of them are blends of various base oils. I fear that in the future, there will be precious few oils which can be identified as a "true" Group-whatever oil, since they are all so "hybridized."
FWIW, and I may be wrong on this since it's been so long, but as I recall from my flying days, we almost always used MIL-L-23699 oil for our jet engines, but there was an alt spec I don't remember for when the temps went below either -40 or -60C. I don't know what this stuff was, but it must have been pretty special to stay pumpable that cold, and protect a superhot jet engine while running. Obviously, SOME oil can do this.