Recently started hearing a strange noise from the C63s, sounds like the front left side is rubbing or something is making contact when I go over bumps. Only the driver's front, nothing while driving at speed, but going over a speed bump or something and it makes a noise like the wheels are rubbing. Had a friend in the car notice the same thing.

I pulled the wheel and didn't see any signs of wear or rubbing anywhere on the tire or in the wheel well, and I shook everything I could get my hands on and didn't hear any clunking or see any signs of loose bolts or something detached. Only thing I noticed is a possible oil slick / sheen on a few components around the shock/strut.

I know the car has adaptive / adjustable suspension. FCPEuro seems to only list an air suspension for the front left, but I'm not sure that's right. I'm at a loss on what to check and how to check before I just start buying parts and throwing money at the problem or taking it to a shop for diagnosis.
-Bob

Sorry, wrong sub - moved it. Can an admin delete this thread?

I needed a new strut, wasn't the hardest to replace but it solved the issue.

Nope, it was a bad strut. Replaced it and all is good. Nothing to do with a boot or joint or grease or 1/2 shaft or axle.