I thought PS Fluid was the same as ATF minus the detergents, color and odor. I thought the detergent part was one of the reasons to mix with synthetic oil in the first place.
LSA is available on line as a surplus item. It is what Uncle Sam paid $$$$$ to develop and is now cheap. I paid about 10 bucks for the last quart-won't need another-shake well before using-Lubricant-small arms.
SARCO still has it....but they don't have those little plastic bottles
remember those, huh.