I've yet to hear any moans/groans with over 2 yrs after install (could be a Texas weather thing).

I used a full package of the Powerflex lube on each pair, lubed the chilled metal sleeve OD and heated bushing bore (ID) pre-assembly, then lubed the bushing "friction face" (flat surface around sleeve bore) & sub-frame surface the friction face rotates on. A total of 4 surfaces need to be lubed pre-assembly.

The sleeve chilling & bush heating actually creates a larger "gap" between the parts, this keep the lube in the area during assembly.

Powerflex uses a proprietary copper base lube/blend, and stresses that although basic copper lube looks identical, its use WILL cause creaks/moans/groans.

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'03 X5 4.4 Sport, last of the M62s (8-03 build date)
I believe in deadication to craftmanship in a world of mediocrity!