MAHLE 42286CP.010 Engine Piston Ring Set Oversize - 0.010

The MAHLE 42286CP.010 is a premium oversize (+0.010") engine piston ring set engineered as a direct OE replacement for the GM 6.6L Duramax diesel engine. Designed to restore proper cylinder sealing and engine compression during engine rebuilds or overhauls, this ring set delivers the same form, fit, and function as original equipment components.

Key Features:

• +0.010" Oversize — designed for cylinders bored or honed 0.010" over standard bore for proper fit and sealing
• SAE 9254 High-Alloy Steel Base Material — provides superior tensile and yield strength, extended fatigue resistance, and increased material hardness
• Pre-Lapped Finish — rings are pre-lapped at the factory to seat immediately, virtually eliminating traditional break-in time
• Barrel-Faced Compression Rings — optimized contact area for more efficient compression and reduced blow-by
• CNC-Controlled Gap Chamfer — precision-machined gaps optimize compression seal and minimize combustion gas leakage
• Reverse Twist Intermediate Rings — improves groove side sealing with taper-faced machining to enhance cylinder wall contact
• CP-20 Oil Ring Assemblies — exclusive 20-degree ear angle design provides maximum side seal against the cylinder wall with a chemically polished expander for enhanced oil drain-back
• Optimized Ring Tension — ring materials, coatings, and tension are application-specific to reduce friction and extend service life

MAHLE is the world's largest piston ring manufacturer, with over a century of experience supplying OE and aftermarket applications. Over 60% of production engines built in North America utilize MAHLE pistons or rings. The 42286CP.010 ring set is the preferred choice for professional engine builders seeking a reliable, installer-friendly solution for diesel engine rebuilds.