MAHLE 51845CP.030 Premium Piston Ring Set Oversize - 0.030

The MAHLE 51845CP.030 is a premium engine piston ring set engineered for a +0.030" oversize bore. MAHLE is the world's largest manufacturer of piston rings, and the Original CP-series sets reflect decades of OE research and development, delivering the precision fitment and durability demanded by professional engine builders and technicians.

Key Features:

• +0.030" Oversize Bore: Designed specifically for engines bored 0.030" over standard, ensuring proper fit and ring seal during engine rebuilds
• Barrel-Faced Compression Rings: Provide a more efficient sealing contact area for improved compression and reduced blow-by
• CNC-Controlled Gap Chamfer: Precisely machined gaps optimize compression retention and minimize blow-by during seating
• Pre-Lapped Finish: Rings are pre-lapped at the factory to seat quickly and virtually eliminate extended break-in time
• Optimized Ring Tension: Ring materials, coatings, and tension are matched to the application for reduced friction and long service life
• Reverse-Twist Intermediate Ring: Enhances groove-side sealing for improved oil and compression control
• High Tensile Strength Materials: Engineered to resist stress, minimize groove pound-out, and provide excellent cylinder wall conformability

The MAHLE Original piston ring line — formerly marketed under the Perfect Circle brand — has been trusted by professional automotive technicians for over 100 years. These rings deliver reliable oil economy, effective blow-by control, and low-friction performance whether used in a routine engine overhaul or a full performance rebuild.