Running on the old races is a sure fire way to prematurely wear out your new bearings. I've replaced quite a few bearings Very early in their lift after the PO/PM decided the old races looked fine...

Jonathan

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Blue Ridge Mercedes
Jonathan Hodgman
http://www.blueridgemb.com/
Enthusiast Service, Restoration & Tuning.
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Located in the Atlanta area
Specializing in all pre and post merger AMG's including Hammers and DOHC M117 engines.
Mercedes Repair Atlanta