Have a growing leak where the line from PS reservoir connects to radiator. Fluid is almost to "min" mark, so I guess I need to get a new rubber hose and add fluid. PerhapsI should change it? My Haynes manual shows no specified interval for changing it. Does it need to be done? Filter?

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former: 83 300D, 97 C230, 93 400E

current: 08 C300 Luxury , 92 500SL