Thanks I appreciate the replies, but there is no indication on the Prestone container as to what the contents are other than it is power steering fluid. Others had additives to decrease leakage.
I take it then that these brands are acceptable, i.e., Prestone, STP, etc
If if is acceptable, is it as easy as unscrewing the black top screw, lifting the metal cap, and pouring in
On my Olds this is much simpler, but better safe than sorry with ma Benz if I don't know what I am doing.
I already bought the Prestone stuff, would like to add if OK.
Pic of fluid attached.