Actually alot of people recomend you flush out the old, change the filter and fill up with Valvoline synthetic PS fluid. I did it with the help of info on this forum. Easy and quick. If it's dark and brown it needs to be changed.

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Karl B
95 E300 D
2006 Mazdaspeed 6
2001 GMC Yukon XL
1997 Contour SVT
Mazda RX-7 SCCA race car