Date registered: Jan 2014
Vehicle: 2008 AMG CLK63 Conv., 2012 R350 4-Matic, Wife's 2015 C300 sedan
Location: Cypress Texas
Mentioned: 7 Post(s)
Quoted: 2418 Post(s)
If you've hit a curb or a big pothole you could have bent something, possibly a control arm, less possibly a drive shaft. Not easy to spot visually. Only way to check a drive shaft, for example, is to put a dial gauge on a magnetic base against the shaft and see how much the needle moves back and forth as the shaft is rotated slowly by hand. Not unusual for a bona fide mechanical engineer, but probably a bit beyond the average grease-monkey. You could check for run-out on the brake rotor or its mounting on either side too in much the same way.
Even more unlikely is that you've somehow bend the entire frame.
My wife's 2015 C300 RWD certainly doesn't have any vibration and it's clearly BS that noticeable vibration is within limits (unless we're talking princess and the pea type stuff here).
"Semper In excretio, solum profundum variat" - unknown
They called me mad, and I called them mad, and damn them, they outvoted me" - Nathaniel Lee