MAHLE 3150036-005 Plasma-Moly Piston Ring Set 4.005 in. Bore +0.005 in. Oversize

The MAHLE 3150036-005 is a precision-ground, plasma-moly piston ring set designed for 8-cylinder engines with a 4.005-inch (+0.005" oversize) bore. Built to OE-quality standards, this file-fit ring set features carbon steel construction with standard tension and ring widths of 1/16 in. top, 1/16 in. second, and 3/16 in. oil — making it a direct-fit solution for engine rebuilds requiring a slight oversize bore.

MAHLE plasma-moly piston rings are engineered to maximize combustion sealing and minimize frictional losses, delivering measurable gains in compression efficiency and oil control. The plasma-moly coating on the top ring provides outstanding wear resistance and break-in characteristics, ensuring long service life even under demanding operating conditions.

Key Features:

• Plasma-moly top ring with barrel face for fast, consistent break-in and superior cylinder wall contact at TDC and BDC
• Napier THG (Tapered Hook Groove) second ring for superior oil scraping, combustion gas management, and top ring stability
• CP-20 3-piece oil control ring with 20-degree ear angle and stainless steel expander between two chrome-faced steel rails for maximum conformability and cylinder wall seal
• File-fit design — end gaps are set by the installer for precise, application-specific fitment
• Carbon steel construction with standard tension for reliable street, performance, or marine applications
• Manufactured under strict MAHLE quality controls — rings are keyed to prevent incorrect installation
• Sold as a complete set for one 8-cylinder engine

MAHLE is the world's largest piston ring manufacturer, supplying OE rings to the majority of North American engine builders. The 3150036-005 ring set brings that same OE engineering to your engine rebuild, overhaul, or re-ring project. Also referenced as 315-0036.005 and Clevite MAHLE 3150036.005.