Well I finally got around to replaceing those sway bar bushings and still have the squeak. I really don't feel like replacing any of the suspension linkage bushings since they're a bit harder to do, so instead I just sprayed all of the bushings with some spray lube and so far it's done the trick. Unfortunitly it's not the best fix, but it'll work for the rest of this cars life.

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1992 Mercedes-Benz 400E
2002 Mercedes-Benz ML500