MAHLE 51669CP.030 Original Engine Piston Ring Set Over Bore - 0.030

The MAHLE Original 51669CP.030 is a premium engine piston ring set sized at +0.030" oversize, engineered to restore cylinder sealing, reduce oil consumption, and extend engine service life. As a global leader in piston ring technology, MAHLE designs these rings directly from OE specifications, delivering factory-level fit and performance for engine rebuilds and overhaul applications.

These installer-friendly rings arrive pre-lapped and ready to seat immediately, virtually eliminating break-in time. Ring materials, face coatings, and ring tension are precisely calibrated for each application to minimize friction and deliver long-lasting durability.

Key Features:

• Plasma-moly faced upper compression ring — barrel-faced contact surface for efficient compression and reduced blow-by
• CNC-controlled gap chamfer on compression rings for optimized sealing performance
• Reverse-twist intermediate ring with taper-face machining for superior groove side sealing
• CP-20 oil ring assembly — exclusive 20-degree ear angle provides best-in-class side seal against the cylinder wall
• Chemically polished oil ring expander for enhanced oil drain-back performance
• +0.030" oversize for use with bored or worn cylinders measuring 0.030" over standard
• Engineered to OE standards — driven by OE requirements for reduced friction, lower ring mass, and minimized oil consumption

MAHLE Original piston ring sets are the trusted choice of professional engine builders, backed by decades of OE development and the most extensive piston ring testing program in the industry. Each set is manufactured to exacting tolerances, ensuring reliable compression, oil control, and long service life.