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piston ring

  1. Rod bearing vs. piston ring clearance

    E63/E64 M6 Discussion
    Hi all, We all know S85 consume oil, and it was due to loose setup of the piston ring. I have been checking rod bearing issue, and today I have learned that the clearance was .001mm which is too tight. Especially, for an engine that uses 10w-60 castrol tws. I am really surprised why BMW choose...