MAHLE 4125MS-15D Performance Piston Ring Set 4.125" Bore 1.5mm 1.5mm 3.0mm Drop-In

The MAHLE 4125MS-15D is a high-performance piston ring set designed for 4.125-inch bore engines. This drop-in ring package features a metric configuration with 1.5mm top ring, 1.5mm second ring, and 3.0mm oil control ring, offering an excellent balance of sealing performance and reduced friction for performance applications.

Key Features:

• 4.125-inch bore diameter with drop-in fitment (no filing required)
• Top compression ring: 1.5mm positive twist ductile iron with barrel face and plasma-moly inlay coating for superior wear resistance
• Second compression ring: 1.5mm taper hook groove design for improved sealing
• Oil control ring: 3.0mm standard tension design
• Ultra-flat ring flanks maximize ring-to-piston sealing and minimize friction losses
• Plasma-moly coating provides excellent scuff resistance and rapid break-in
• Engineered for performance street and racing applications

MAHLE Motorsport has pioneered advanced piston ring technology backed by over 90 years of racing heritage. These rings are designed using computer simulation to minimize friction while maximizing sealing efficiency, delivering measurable power gains on the dyno and track. The precision-engineered ring pack ensures consistent performance and durability in demanding performance environments.