MAHLE 42171.030 Premium Engine Piston Ring Set +0.030 Over

The MAHLE 42171.030 is a premium engine piston ring set sized at +0.030" oversize, engineered to OE specifications for reliable engine restoration and performance. As a global OEM supplier, MAHLE manufactures piston rings to the same standards found in original factory assemblies, ensuring precise fit, consistent sealing, and long service life.

Key Features:

• Manufactured to OE specifications — same quality as factory-installed rings
• +0.030" oversize bore sizing for use with standard engine rebuilds at first oversize
• Ring materials and coatings optimized for reduced friction and extended engine life
• Pre-lapped finish promotes rapid seating and minimizes break-in time
• Compression rings feature a barrel-faced contact area for efficient cylinder sealing and reduced blow-by
• Intermediate rings designed with reverse twist geometry for improved groove side sealing
• Oil control ring assembly engineered to minimize oil consumption while maintaining proper cylinder lubrication
• Complete set includes upper compression ring, lower compression ring, and oil control ring assembly

MAHLE is a leading global OEM supplier of pistons, rings, and engine components, trusted by professional engine builders and automotive technicians worldwide. The 42171.030 ring set is an ideal choice for engine overhaul or rebuild applications requiring first oversize components.