Since I live in a cold weather climate, I use the GM Cold Climate Power Steering fluid. It does eliminate the foaming under hard use and in the winter it is smooth as glass. I had pump whine during extended hard use (Durango), now it is very quiet.
Dave
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1999 AMGeneral H1 6.5TD BLACK Wagon e-Lockers Front and Back, Rubberduck4x4 RockTubes, Extended Undercarriage Protection,"Big Duck" 2" body lift/2 1/2" suspension lift, 41" IROK Radials on 17" Cepeks w/Rock Rims, (in process)Centered front diff, 3.08 gears, 12k Brakes and 12k halfshafts
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