Sounds the time for replacement to me. How many mileage on your struts? Let me know what strut you're thinking. I have a pair right in my garage right now. Just need some time to finish the project.

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01' 3.0i E53 (M54) with 164,000 miles
07' 3.0si E83 (N52) with 134,000 miles
08' 3.0si E70 (N52) with 91,000 miles