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This Mahle 2mm oil ring support rail is specified in the product listing at a 3.989–3.947 diameter range and serves as a dedicated support rail for the oil-control ring assembly. Built to Mahle MS standards, it ensures correct seating and consistent ring pack geometry for engines matching the listed size. The rail is intended for precision engine rebuild work where exact fitment matters.
Mahle MS 3.989-3.947 2mm Oil Ring Support Rail
