MAHLE 4085MS-15 Piston Ring Set Bore File Fit - 4.080 1.5mm 1.5mm 3.0mm

The MAHLE 4085MS-15 is a high-performance piston ring set engineered for 4.080" bore engines with a +.005" oversize tolerance. This file-fit ring set features standard tension and a proven 1.5mm, 1.5mm, 3.0mm configuration designed to optimize sealing and performance.

Ring Configuration:

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

Key Features:

• File-fit design allows precise end gap adjustment for optimal performance
• Ultra-flat ring flanks maximize ring-to-piston groove sealing
• Plasma moly coating on top ring reduces friction and increases durability
• Advanced ring simulation and computer development minimizes parasitic friction losses
• Standard tension oil ring set for reliable lubrication control

MAHLE's expertise in piston ring technology delivers measurable performance gains through reduced friction and improved sealing. The precision-engineered ring profiles and advanced coatings make this set ideal for performance engine builds, rebuilds, and racing applications where reliability and horsepower matter.