MAHLE 4165MS-15 Performance Piston Ring Set Bore File Fit - 4.160 005 1.5mm 1.5mm 3.0mm

The MAHLE 4165MS-15 is a high-performance piston ring set designed for 8-cylinder engines with a 4.160" bore plus .005" oversize. This file-fit ring set features a metric 1.5mm, 1.5mm, 3.0mm configuration with standard tension, engineered to deliver maximum horsepower and durability in demanding performance applications.

Advanced Ring Design:

• Top ring: Ductile iron with plasma moly barrel face coating for superior wear resistance and scuff protection
• Second ring: Cast iron reverse twist design for optimal oil control and combustion sealing
• Oil ring: 3-piece standard tension design for reliable oil management
• Ultra-flat ring flanks maximize ring-to-piston sealing and reduce blow-by

Performance Features:

• Developed using advanced piston ring simulation and computer modeling
• Minimized friction design provides "free" horsepower gains
• File-fit ends allow precise end-gap customization for specific bore dimensions
• Standard tension configuration balances sealing performance with reduced cylinder wall loading
• Metric ring widths: 1.5mm top, 1.5mm second, 3.0mm oil ring

MAHLE's motorsports-grade piston rings are engineered to exceed OEM specifications, providing professional engine builders and performance enthusiasts with proven reliability on the dyno and track. Each set includes rings for one complete 8-cylinder engine.