MAHLE S42188 Engine Piston Ring - Set

The MAHLE S42188 is a premium OE-replacement engine piston ring set engineered to meet or exceed original equipment specifications. MAHLE is the world's largest piston ring manufacturer, supplying more than 60% of production engines built in North America, and this set reflects that same OE-level engineering in an aftermarket package.

Key Features:

• SAE 9254 High Alloy Steel Construction: Provides superior tensile and yield strength, extended fatigue resistance, and increased material hardness for long-lasting durability
• Plasma-Moly Top Compression Ring: Barrel-faced contact surface with CNC-controlled gap chamfer optimizes compression efficiency and reduces blow-by
• Napier Second Ring: Reverse twist design with taper-race machining delivers better groove-side sealing, superior oil control, improved combustion gas management, and top ring stability
• CP-20 Oil Ring Assembly: Features an exclusive 20-degree ear angle for the best possible side seal within the piston oil ring groove, with a special chemical polish on the expander for enhanced oil drain-back
• Pre-Lapped Design: Rings are pre-lapped to seat immediately, virtually eliminating engine break-in time
• OE Form, Fit & Function: Designed as a direct replacement to restore original engine performance and minimize oil consumption

MAHLE piston rings are driven by OE requirements — reducing friction and ring mass while minimizing engine oil consumption and delivering extended service life. The S42188 is the ideal choice for engine rebuilders and technicians who demand professional-grade quality and ease of installation.