Dry bearings are liekly to be nosiy. Tight bearings might also do this. Loose bearings can cause jitters in your steering, etc.
You might jack up the right front side of the vehicle and spin the tire. If it spins freely, it's likely not too tight. Do you hear any binding sort of sound?...crunch? This approach is by no means conclusive.
I didn't mean to imply that your oil change guy was inept. I wasn't sure what sort of shop you'd been to. If you're comfortable with them, move forward. Your car is about 16 yrs. old, so it's not unlikely the bearing(s) are tired.
Be sure they remove/replace the existing bearing races when
they install new bearings.
1991 300-SEL - Model 126
M103 - SOHC
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