MAHLE 4005MS-15 Piston Ring Set Bore File Fit - 4.000 1.5mm 1.5mm 3.0mm

The MAHLE 4005MS-15 is a high-performance piston ring set designed for 4.000" bore engines with a +0.005" oversize. This file-fit ring set features a precision-engineered 1.5mm, 1.5mm, 3.0mm configuration with standard tension for reliable sealing and optimal performance.

Ring Configuration:

• Top Ring: 1.5mm ductile iron with plasma moly coating and barrel face profile for superior wear resistance
• Second Ring: 1.5mm cast iron reverse twist design for enhanced oil control
• Oil Ring: 3.0mm three-piece standard tension configuration

Key Features:

• File-fit design allows precise end-gap customization for your specific application
• Ultra-flat ring flanks maximize ring-to-piston sealing efficiency
• Plasma moly top ring coating provides excellent scuff resistance and durability
• Engineered using advanced piston ring simulation and computer development tools
• Optimized to minimize friction and release free horsepower
• Standard tension oil rings balance sealing performance with reduced drag

MAHLE's precision manufacturing process ensures consistent quality and performance whether on the dyno or the track. The reverse twist second ring design enhances scraping action for improved oil control while the three-piece oil ring assembly provides superior conformability to cylinder walls.