The Harbor Freight ball joint tools don't work. I tried them and a rental from a parts store. They were too small. 3 days and no luck. Finally bought a knockoff of the BMW tool. Off in 5 minutes.

This is the one I used. Notice the threaded piece in the center, that's what is needed to open wider.

Ball Joint separator press tool BMW Mercedes Audi Mini

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2005 X5 4.4i SterlingGrau, Sport Package, DSP
Build 3/12/2005