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The MAHLE OE plain piston ring set is a top compression ring assembly using gas-nitrided steel, sized 4.565 x .043 with .170 RW, supplied as a plain ring set. It provides the sealing surface needed to control combustion blow-by and maintain compression during engine rebuilds and repairs. Practical for OE-style replacements where ring mass and surface treatment match factory intent.
Mahle Rings Gas Nitride Steel Performance Top Compression Ring 4.565 x .043 .170 RW Plain Ring Set
