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If you bought the car used, I guess you will never know. Maybe that is best. But I am sorry you have had an expensive and bad initial experience with the M3. A car should not need rod bearing replacement at 50k or 100k or 150k miles, but enough of these motors have failed that many of us think this preventative maintenance is a worthwhile expense to offset the risk of a much more expensive failure and there have been almost no cases of the job being done wrong.
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