the facelift models have a removable plastic clamshell - I applied some general NLGI2 wheel bearing grease to the slider pins and the wiper arm piston that sticks out from the end and clipped it back on - this exercise smoothed out the clanky noise it had and sped up a little too.

The old grease was kind of waxy and pretty hard and nearly non existant on the bottom two sliders

__________________
2012 BMW X5 (Beef + Granite suspension model)

1995 E300D - The original humming machine (consumed by Flood 2017)
2000 E320 - The evolution (consumed by flood 2017)