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Use whats specified for your system. Ford specified it for a reason & over the years hasn't changed it's specification requirements on systems requiring type F fluid. I still use it in my 94 Taurus P/S system.
Who knows whats in P/S fluid, or other type tranny fluid, that might not be compatable with the systems plastic, rubber, or metal parts, over time.
Type F fluid is still widely available, so why would you want to put something else in there, when type F has gotten it this far????
It's your vehicle, so you can pour in whatever you like, but you'll have to warranty the work you do!!!!! lol