I just did the flush and fill on my 1979 300SD's power steering and replaced the filter and return hose (used Redline Synthetic PS fluid, only $9 a quart). I have been wondering, though, if it's okay to pump out all of the fluid--or if this would damage the pump. I went through a gallon of Valvoline power steering fluid in less than 10 seconds when I did the flush and had my helper shut it off as soon as the fluid was out of the pump--it made a metallic noise for a split second before the engine was shut off.

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1967 W110 Universal Wagon, Euro, Turbo Diesel, Tail Fins, 4 Speed Manual Column Shift, A/C
1980 W116 300SD Turbo Diesel, DB479 Walnut Brown, Sunroof, Highly Optioned, 350,000+ Miles