MAHLE 41909.030 Piston Ring Set .030 Oversize Moly-Faced 8-Cylinder

The MAHLE 41909.030 Engine Piston Ring Set delivers OE-quality precision engineering for GM Duramax 6.6L diesel engines requiring .030 inch oversize rings. This complete set includes premium piston rings for all eight cylinders, featuring moly-faced compression rings with a 4.055 inch bore diameter and a proven 3.0mm, 2.0mm, 3.0mm thickness configuration.

Advanced Engineering Features:

• Plasma-moly compression rings with barrel-faced contact area for efficient compression and reduced blow-by
• SAE 9254 high alloy steel construction provides superior tensile strength, yield strength, and extended fatigue resistance
• Pre-lapped ring faces seat immediately, virtually eliminating break-in time
• Napier second rings deliver superior oil control and improved combustion gas management
• CP-20 oil ring assemblies with exclusive 20-degree ear angle provide optimal side seal and enhanced oil drain back
• CNC-controlled gap chamfer optimizes compression seal
• Reverse twist intermediate ring design ensures better groove side sealing

MAHLE is a leading OE piston ring manufacturer, supplying components to major vehicle manufacturers worldwide. These rings are engineered to OE specifications with optimized ring tension and materials to reduce friction, minimize oil consumption, and extend service life. Ideal for engine rebuilds and performance applications on GM Duramax turbodiesel engines.