MAHLE S51471CP Engine Piston Ring Set - OE Replacement Stainless Steel

The MAHLE S51471CP Engine Piston Ring Set is a precision-engineered, OE-quality replacement ring set built to restore proper compression, oil control, and sealing performance in worn or rebuilt engines. As the world's leading manufacturer of piston rings, MAHLE designs this set to meet or exceed original equipment specifications for form, fit, and function.

Key Features:

• OE-Grade Upper Compression Rings – Cast iron or ductile cast iron top rings feature a positive twist and barrel face for fast, consistent break-in and reliable compression sealing
• Superior Second Ring Design – Provides excellent oil control, improved combustion gas management, top ring stability, and sealing for minimal power loss and reduced oil consumption
• CP-20 Oil Ring Assembly – Features MAHLE's exclusive 20-degree ear angle for the best possible side seal within the piston oil ring groove, along with a chemically polished expander for enhanced oil drainback
• Pre-Lapped for Fast Seating – Ring sets are pre-lapped at the factory to seat quickly, virtually eliminating extended break-in time
• Optimized Materials and Coatings – Ring materials, coatings, and tension levels are engineered for reduced friction and extended service life
• Installer-Friendly Design – Engineered to simplify installation and minimize the risk of incorrect assembly

MAHLE piston rings are driven by OE requirements, focusing on reducing friction and ring mass while minimizing engine oil consumption and delivering long service life. Trusted by professional engine builders and technicians for over 100 years—formerly marketed under the Perfect Circle brand—MAHLE Original ring sets are the standard of choice for both engine repair and full rebuilds.