Best practice is to rebuild the entire suspension rather than part by part. Worn parts put more stress on new parts as do new parts on worn parts. If the entire suspension is rebuilt with OE or OEM life should be 75 to 100,00 miles or more.
I have done a lot of work improving the handling. I have not seen the need to use poly bushings in other than the subframe. Suspensions are designed so that it all works together to result in particular handling characteristics. I stayed with parts that were designed to work together. Primary reason was that the X5 understeers more than I like already. I didn't want to risk increasing understeer. I don't think the increased cost of poly bushings pass the value equation.
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X5 4.6 2002 Black Sap, Black interior. 2013 X5M Melbourne Red, Bamboo interior
Dallas
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