Any recommendations for a lube to stop the "creaking" of factory sway bar bushings on a 2002 C230K? They creak and groan every time I go over a bump in the road. Thanks.

I use silicone grease. Syl-glide is one brand. Marson is another.
Works for both rubber and poly bushings.

Probably best to fit new ones, and grease them going on.

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1986 300E 5-Speed 240k mi.

Yes, slicone grease. I just got an aftermarket sway bar, for my new little non MB toy. It came with a tube of silicone grease.

Good luck,