MAHLE 40276CP Plasma-Moly Engine Piston Ring Set 3.400 in. Bore 6-Cylinder Standard

The MAHLE 40276CP is a premium plasma-moly engine piston ring set engineered for 6-cylinder applications with a 3.400-inch bore diameter at standard oversize. Designed with OE form, fit, and function, this ring set delivers the same performance and precision found in original equipment applications.

Key Features:

• Plasma-Moly Face Coating — Top and second rings feature a plasma-moly coating for reduced friction, improved wear resistance, and faster seating
• SAE 9254 High Alloy Steel Base Material — Provides higher tensile and yield strength, extended fatigue resistance, and increased material hardness over standard ring materials
• Cast Iron Top & Second Rings — Top ring and second ring are cast iron construction, each with an axial height of 0.0781 in. (5/64 in.)
• Stainless Steel CP-20 Oil Ring Assembly — Features MAHLE's exclusive 20-degree ear angle for optimal side sealing in the piston oil ring groove, with a shallow groove design and axial height of 0.1875 in. (3/16 in.)
• Ring Dimensions: Top Ring — 5/64 in. | Second Ring — 5/64 in. | Oil Ring — 3/16 in.
• Standard Oversize — Direct OE replacement at standard bore dimensions
• Installer-Friendly Design — Pre-lapped to seat quickly, virtually eliminating break-in time
• Optimized Ring Tension — Ring materials, coatings, and tension are tuned for reduced friction and extended service life

MAHLE is one of the world's largest OE piston ring manufacturers, and the 40276CP reflects that engineering heritage. The CP-20 oil ring assembly's chemically polished expander enhances oil drainback, while the compression rings feature a barrel-faced contact surface for efficient sealing and reduced blow-by. Sold as a complete set for one 6-cylinder engine.