I know it's not a problem with the strut (if you mean shock absorber by strut). I took the shocks off and set the car back down on it's wheels. It still has the same creaking sound. I also replaced the front sway bar bushings. Any other suggestions?? Any chance it could be the springs?? When I hold the spring, I feel a vibration when the car is slowly being pushed down. I'm wondering if that isn't my problem and how to test for that??

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'95 S320 LWB
'87 300SDL
'04 E500 wagon 4matic