MAHLE 41137CP.040 Perfect Circle Premium Piston Ring Set Oversize - 0.040

The MAHLE Perfect Circle 41137CP.040 is a premium piston ring set ground to 0.040" oversize, designed for use in engine rebuilding and overhaul applications. MAHLE Perfect Circle is one of the most trusted names in OEM and aftermarket piston ring technology, supplying rings to major vehicle manufacturers worldwide and setting the standard for dimensional accuracy, surface finish, and long-term sealing performance.

These rings are precision-manufactured to restore proper compression, minimize oil consumption, and deliver like-new engine performance. The .040" oversize designation makes them ideal for engines that have been bored to accept an overbore piston, as is standard practice during a complete engine rebuild.

Key Features:

• 0.040" Oversize – Engineered for use with .040" overbore pistons in engine rebuild applications
• Premium MAHLE Perfect Circle Construction – Manufactured to OEM-equivalent tolerances for reliable sealing and long service life
• Compression Ring Technology – Precision face geometry promotes rapid ring seating and consistent cylinder wall contact
• Oil Control Ring Included – Full ring set includes top compression ring, second compression ring, and oil control ring assembly
• Durable Surface Treatments – Rings feature treated surfaces to resist wear, scuffing, and corrosion
• Consistent Quality Control – Each set is manufactured to strict dimensional standards for proper end gap and radial depth

MAHLE Perfect Circle piston rings are a go-to choice for professional engine builders and serious DIY mechanics who demand reliability. Whether you're performing a complete engine overhaul or replacing worn rings during a rebuild, the 41137CP.040 delivers the fit, finish, and performance expected from an industry-leading manufacturer.