1995 S420 Upper Control Arm noise

My 1995 S420 Upper Control Arm noise, about a month after my mechanic replaced it, makes a rattling noise when I turn the wheel or go over bumps.
He checked the front end the other day and said everything looks tight. He sprayed the control arm with some lubricant and now the problem is worse.
Could this just be something rubbing against the control arm? Or does it sound like a more serious problem?
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