MAHLE 42286CP.030 Premium Piston Ring Set Oversize - 0.030

The MAHLE 42286CP.030 is a premium OE-quality piston ring set ground to a +0.030" oversize bore specification, designed for the Nissan 2.5L 4-cylinder QR25DE and QR25DER engines. As one of the world's largest OE piston ring manufacturers, MAHLE engineers these rings to meet or exceed original equipment standards for compression sealing, oil control, and long-term durability.

Key Features:

• +0.030" Oversize: Precisely sized for bores that have been machined 0.030" over standard, ensuring proper ring-to-wall fit after engine reconditioning
• Pre-lapped finish: Rings are pre-lapped to seat immediately, virtually eliminating extended break-in time
• Optimized ring materials and coatings: Materials, coatings, and ring tension are all engineered for reduced friction and extended service life
• Barrel-faced compression rings: Feature a barrel-faced contact area and CNC-controlled gap chamfer to maximize compression efficiency and minimize blowby
• Reverse-twist intermediate rings: Designed for superior groove side sealing with taper race machining to enhance cylinder wall contact
• CP-20 oil ring assembly: Exclusive 20-degree ear angle provides optimal side sealing against the cylinder wall; chemically polished expander promotes enhanced oil drainback
• OE-driven engineering: Developed to reduce friction and ring mass while minimizing oil consumption and delivering longer service life

MAHLE Original piston ring sets are the preferred choice of professional engine builders, delivering installer-friendly design and confidence-inspiring quality backed by decades of OE manufacturing expertise. Manufacturer Part Number: 42286CP.030. Also referenced as 42286CP .030.