There may be some other additives for seals and such, but I've always used Dex 3/Mercon in my vehicles. It always seems to be on hand, compared to p/s fluid.
As for the statement from Hal, if you were to lift the hoods of a Freaightliner, Pete, KW, or even the Volvo, one truck specifies 15w-40, one may spec P/S fluid. They use the engine oil figuring a driver would have that on hand (always carry a spare gallon to top off the engine) compared to having another bottle of P/S fluid too. They have to haul everything everywhere, so less to carry = more living space.
1978 CJ5 5.0HO/T177/D300, '86 D30/D44 WT axles, 'glass body, 31x10.5 BFG A/T, TDK galv'd frame - DD and weekend toy
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