MAHLE 51240CP.030 Original Engine Piston Ring Set 4.030 in. Bore L4 +0.030 Oversize

The MAHLE Original 51240CP.030 is a premium engine piston ring set engineered for 4-cylinder applications with a 4.030-inch bore (+0.030" oversize). Designed as a direct OE-quality replacement, this ring set delivers the precision fit and long-term durability expected from the world's largest manufacturer of piston rings.

Key Features:

• High tensile and yield strength with excellent hardness and low ring mass for superior stress resistance and minimal groove pound-out
• Cylinder conformability ensures a precise seal against the bore for improved compression and reduced blow-by
• Low friction design promotes oil economy and extended service life
• Ring specifications: 5/64 in. upper compression ring, 5/64 in. intermediate ring, 3/16 in. oil control ring
• Cast iron construction meeting stringent OE material standards
• Pre-lapped finish allows rings to seat immediately, virtually eliminating break-in time
• Sold as a complete set — includes all rings for one 4-cylinder engine (4 sets of rings)
• +0.030" oversize — designed for engines that have been bored 0.030" over standard

MAHLE Original piston rings are driven by OE requirements, incorporating technologies such as narrow compression rings and low-tension oil rings developed directly from original equipment applications. Formerly marketed under the Perfect Circle brand, MAHLE Original rings have been trusted by professional engine builders and automotive technicians for over 100 years. This set is ideal for engine rebuilds requiring a reliable, installer-friendly oversize replacement ring set.