MAHLE 51615CP.030 Original Standard Engine Piston Ring Set Oversize - 0.030

The MAHLE 51615CP.030 is an Original Standard engine piston ring set ground to a +0.030" oversize bore, designed as a direct OE-quality replacement for engines requiring a first oversize re-ring or rebuild. MAHLE is the world's largest manufacturer of piston rings, and this set reflects decades of OE engineering expertise translated directly into an aftermarket replacement component.

Key Features:

• OE Form, Fit, and Function: Engineered to match original equipment specifications for a drop-in replacement fit with no modifications required
• Cast Iron / Ductile Cast Iron Compression Rings: Upper compression rings feature a positive twist and barrel face profile for fast, consistent break-in and immediate cylinder sealing
• Superior Second Ring Design: Provides excellent oil control, improved combustion gas management, enhanced top ring stability, and reduced power loss
• CP-20 Oil Ring Assembly: Features an exclusive 20-degree ear angle for optimal side sealing against the piston oil ring groove, with simplified installation and enhanced oil drain-back
• High Tensile and Yield Strength: Low ring mass combined with excellent hardness delivers stress resistance, minimal groove pound-out, and long service life
• Reduced Friction: Ring tension, materials, and coatings are optimized to minimize friction and engine oil consumption while maximizing cylinder conformability
• +0.030" Oversize Bore: Sized for cylinders bored 0.030" over standard — confirm your exact bore size before ordering

MAHLE Original piston ring sets (formerly Perfect Circle) have been trusted by professional engine builders and automotive technicians for over 100 years. This set delivers the latest OE-derived ring technology for reliable engine performance and long-term durability during engine rebuilds or re-ring service.