Is there any credible / authoritative information as to what to use (or what to avoid) when it comes to power steering fluid for old / antique / classic cars? I'm specifically interested in 1960's Mopar, I have no idea if other brands used different materials for hoses and gaskets and seals that would point to different solutions.
As far as I can tell, besides ideas about the wrong fluid with the wrong additives "gumming up the works" (not that the works in these pumps and steering gears are all that complex), there are concerns about the wrong choice causing leaks where there were no leaks previously. And then all the usual concerns about viscosity, high temperature tolerance, "frothing", etc.
I suppose there are boutique brands of PS fluid marketed for old / classic cars, maybe with solid tech specs behind them that proves they are the way to go vs commonly available retail choices?
As far as I can tell, besides ideas about the wrong fluid with the wrong additives "gumming up the works" (not that the works in these pumps and steering gears are all that complex), there are concerns about the wrong choice causing leaks where there were no leaks previously. And then all the usual concerns about viscosity, high temperature tolerance, "frothing", etc.
I suppose there are boutique brands of PS fluid marketed for old / classic cars, maybe with solid tech specs behind them that proves they are the way to go vs commonly available retail choices?