Just about every auto parts store I've ever been in sells a few different cheap brands (as well as an expensive synthetic) of a product simply labeled "Power Steering Fluid." I've always used this and not worried too much about it. Not much on synthetic fluids myself so I buy the generic PS fluid and don't worry much about it.

@kinghais: The first thing to check is quite simply the fluid LEVEL. It does leak from time to time, and topping it off in the reservoir may solve your problem. It's not critical how full the reservoir is; obviously the filter needs to be covered. I usually fill to about 1.5 inches down from the top rim. There's a faintly etched line in some of them that's barely visible in others. Doesn't matter as long as a) the pump isn't dry and b) the return fluid doesn't overflow the canister and pump out through the lid or something horrific. (Never overfilled one but I imagine that's what would happen.)

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~Michael S.~
Past cars:

1986 300SDL
1987 300SDL
1982 240D
1982 300SD


Current:

1987 300SDL