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I just replaced the bearings on my 08M3 with 60k using WPC treated bearings and am using Mobil 1 0W40 oil for street use. My 60k mile stock bearings had some premature wear but I think they still had life left in them. I do not plan to worry for another 60k or 6 years at the rate I drive. By then hopefully there will be some reports of WPC bearings being inspected after accumulating some miles and we will have an idea how they are working. Based on that, I will decide to change them again or leave them. Might also be higher clearance bearings available then.
If changing bearings as preventative maintenance is not something you want to consider, sell the car and buy a car that does not have this concern.
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