During a recent tire rotation, my indy noticed the front wheel bearings had some play (140K miles on them). He checked, repacked, and adjusted them. I asked him if he uses the a dial indicator to set the adjustment and he said yes.

Within 100 miles the bearings are now growling. Could it be that the bearings were already shot when he readjusted them, and once adjusted correctly they're revealing that fact with the noise? Or is it more likely the indy over tightened the nut when reinstalling, causing the failure? Could the bearings fail that quickly?

My indy wants to replace the bearings (using SKF parts and Mobil 1 grease). Should I let him?

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05 E320 CDI - 175K miles
82 300D - 200K miles (sold)