- I used wheel-bearing grease.

- If anyone has ever used the "slider clips" (that slide along the tracks), please make a recommendation re where to buy it (URL link please), pricing, your experience with it.
With the OEM window regulator being only $150 at dealer, if my sliders ever go bad, I'd probably get a brand-new OEM regulator b/c I know it lasts some 100K miles.

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1998 E39 528i 5sp MT
2006 E53 X5 3.0 6sp MT