MAHLE 4140MS-15 Piston Ring Set Bore File Fit - 4.135 1.5mm 1.5mm 3.0mm

The MAHLE 4140MS-15 piston ring set is engineered for 4.135" bore (+.005" oversize) applications with file-fit installation and standard tension design. This premium ring set features 1.5mm, 1.5mm, 3.0mm ring widths, delivering reliable sealing and performance for engine rebuilds.

Ring Configuration:

• Top ring: Ductile iron with plasma moly coating and barrel face profile for superior wear resistance
• Second ring: Cast iron with reverse twist design for optimal oil control
• Oil ring: 3-piece standard tension construction for consistent cylinder wall contact

Key Features:

• 4.135" bore diameter with .005" oversize tolerance
• File-fit design allows precise end gap adjustment during installation
• Ultra-flat ring flanks maximize ring-to-piston groove sealing
• Standard tension specification balances sealing performance with friction control
• Metric 1.5mm, 1.5mm, 3.0mm ring widths (top, second, oil)

MAHLE utilizes advanced piston ring simulation and computer development tools to minimize friction and unlock free horsepower. The precision-engineered ring geometry and coating technology deliver measurable performance gains on both the dyno and the track, making this ring set ideal for performance rebuilds and racing applications.