MAHLE 51615CP.020 Engine Piston Ring Set 0.020 in. Oversize

The MAHLE 51615CP.020 is an Original standard replacement piston ring set ground to a 0.020-inch oversize bore specification, engineered to deliver OE-equivalent form, fit, and function during engine rebuilds and overhauls.

MAHLE is one of the world's largest OE piston ring manufacturers, and the Original line reflects that expertise with advanced materials, precision tolerances, and technology developed directly from original equipment programs.

Key Features:

• OE Form, Fit & Function: Designed as a direct replacement, matching original equipment specifications for reliable sealing and performance
• Upper Compression Ring: Cast iron or ductile cast iron construction with a positive twist and barrel face for fast, effective break-in
• Second Compression Ring: SAE 9254 high-alloy steel Napier-style design for superior oil control, improved combustion gas management, top ring stability, and reduced power loss
• CP-20 Oil Control Ring: Features an exclusive 20-degree ear angle for optimal side sealing in the piston oil ring groove and simplified installation
• Reduced Ring Mass: Lower ring mass minimizes friction and groove pound-out, extending service life and improving fuel efficiency
• 0.020 In. Oversize: Sized for cylinders bored or honed to 0.020 inches over the standard specification

MAHLE Original piston rings offer high tensile strength, high yield strength, and excellent hardness, translating to stress resistance, long service life, superior cylinder wall conformability, and effective blow-by control. Formerly marketed under the Perfect Circle brand, MAHLE Original ring sets have been trusted by professional engine builders and automotive technicians for over 100 years.