MAHLE 42254CP.020 Engine Piston Ring Set Over - 020

The MAHLE 42254CP.020 is a premium engine piston ring set ground to .020-inch oversize specifications for use during engine rebuilds where the cylinder bores have been machined beyond standard dimensions. Designed and manufactured by MAHLE — a global leader in OE piston ring technology — this set is engineered to deliver factory-level sealing, compression retention, and oil control.

MAHLE's CP-series piston rings are constructed using premium-grade materials and precision manufacturing processes. The upper compression ring (UCR) features a plasma-moly facing over a cast iron body, providing excellent wear resistance and fast seating. The lower compression ring (LCR) is a cast iron design optimized for combustion gas management and oil control. The oil control ring (OCR) is a stainless steel, three-piece assembly with a CP-20 shallow groove design and a 20-degree ear angle, which provides superior side sealing against the cylinder wall.

Key Features:

• .020-inch oversize — designed for re-bored engine applications
• Plasma-moly upper compression ring for rapid break-in and long-term wear resistance
• CP-20 oil ring assembly with 20-degree ear angle for superior cylinder wall sealing
• Chemically polished oil ring expander for enhanced oil drain-back performance
• Premium cast iron and stainless steel construction throughout
• Meets or exceeds original equipment manufacturer (OEM) specifications
• Manufactured by MAHLE, a globally recognized OE supplier to major engine manufacturers

The MAHLE 42254CP.020 piston ring set is the trusted choice for professional engine builders and serious rebuilders who demand precision fitment and long-lasting performance. Whether performing a full engine overhaul or refreshing worn cylinders, this ring set restores compression, reduces blow-by, and controls oil consumption to like-new standards.