MAHLE 51716.030 Standard Piston Ring Set +0.030 Oversize 4.030 in. Bore Cast Iron

The MAHLE Original 51716.030 is an oversize (+0.030 in.) replacement piston ring set engineered to OE specifications. Designed for a 4.030-inch bore, this set utilizes cast iron compression rings and a stainless steel oil ring assembly, delivering the precision fitment and durability expected from a world-class OEM-level supplier. The ".030" designation indicates this set is sized for cylinders bored 0.030 inches over standard, making it a direct choice for engine rebuilds requiring oversize rings.

Key Features:

• Cast iron top and second compression rings with high tensile strength, high yield strength, and excellent hardness with low ring mass
• Stainless steel oil ring assembly with a 0.1575 in. axial height for superior oil control
• Top and second ring axial height: 0.0586 in. (approx. 1.5mm) each
• Shallow groove design for improved cylinder conformability and reduced blow-by
• OE form, fit, and function — engineered to the same standards as original equipment rings
• Provides stress resistance, minimal groove pound-out, and long service life
• Promotes oil economy and excellent blow-by control with low friction
• Sold as a complete set — includes all rings needed per cylinder bore

MAHLE is the world's largest manufacturer of piston rings, with over 100 years of trust among professional automotive technicians. The MAHLE Original line — formerly marketed as Perfect Circle — continues to be a top choice for both engine repairs and full rebuilds, offering the technological advantages developed through extensive OE partnerships, including narrow compression rings, low-tension oil rings, and coated ring options.