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Mahle's CP20 standard-tension chrome ring set includes a 4.0 mm oil ring assembly and is identified with the 3.5239 x 4.0MM .139 RW sizing. This ring assembly is intended for precise bore applications calling for the listed dimensions, offering OE-style sealing and oil control for top-end rebuilds. Use it when cylinder service requires the specific 3.5239 sizing and 4.0 mm oil ring thickness.
Mahle Rings CP20 Standard Tension 4mm Oil Ring Assembly - 3.5239 x 4.0MM .139 RW Chrome Ring Set
