MAHLE 42252CP Premium Plasma-Moly Engine Piston Ring Set

The MAHLE 42252CP is a premium plasma-moly engine piston ring set engineered to OE standards for reliable, long-lasting performance. MAHLE is one of the largest OE piston ring manufacturers in the world, and this set reflects their commitment to advanced materials and precision manufacturing.

Ring materials, coatings, and ring tension are all optimized for reduced friction and extended service life. The set is pre-lapped at the factory to seat immediately upon installation, virtually eliminating traditional break-in time and making it an installer-friendly choice for professional and DIY engine builders alike.

Key Features:

• SAE 9254 high-alloy steel base material — delivers higher tensile and yield strength, extended fatigue resistance, and increased hardness compared to standard steel rings
• Plasma-moly top ring coating — provides excellent wear resistance and reduced friction against the cylinder wall
• Barrel-faced compression rings with CNC-controlled gap chamfer for optimized compression and reduced blow-by
• Napier/reverse-twist second ring — provides superior oil control, improved combustion gas management, and improved top ring stability
• CP-20 oil ring assembly — features an exclusive 20-degree ear angle for the best possible side seal in the piston oil ring groove; chemically polished expander promotes enhanced oil drain-back
• Pre-lapped from the factory for immediate seating and minimal break-in time
• Designed to OE form, fit, and function for a proper drop-in replacement

The MAHLE 42252CP piston ring set is built to handle the demands of modern engines, delivering consistent compression sealing, superior oil control, and long-term durability whether used in a stock rebuild or performance application.