A qt per day might be too much of a leak to stop with seal conditioning power steering fluid, but probably worth a shot. I've limped my leaking box along for more than two years now using powersteering fluid with stopleak/seal conditioners; but mine never leaked that severly.

I don't have the facility to do this repair myself, and I haven't felt like spending the money to get it fixed by a mechanic (expensive). But will probably address it once the front end suspension work is done along with motor mounts in the next couple of years, or sooner if it gets really really bad.

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1982 240 D, 308,000 - 321,127 miles (sold)
1982 300 TD,166,500 - 226,000 miles
1998 E 320, 120,000 - 144,000 miles
2005 C 230 K, 26,000 - 77,000 miles (sold)