About 4 years ago, my car creaked when I would drive over speed bumps and ramps. Took the car to my mechanic and he used WD40 to lubricate all the bushings in the front. He used 1-2 cans. It worked like a charm. Even to this day, there are no creaks.

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2010 W212 E350 Sport
1996 W210 E320 (220K miles)