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This Mahle 2mm oil ring support rail is sized for 4.240–4.280 bores and serves as a precision replacement ring rail in piston assemblies. Manufactured to match Mahle MS specifications, the support rail is intended to restore correct oil control ring seating and maintain proper ring pack geometry during engine operation. It’s a targeted service part for rebuilds requiring the listed diameter range.
Mahle MS 4.240-4.280 2mm Oil Ring Support Rail
