MAHLE 50134CP.040 Original Standard Engine Piston Ring Set Oversize - 0.040

The MAHLE Original 50134CP.040 is a standard replacement engine piston ring set ground to a +0.040" oversize bore, engineered to OEM specifications for reliable engine rebuilding and repair. Part of MAHLE's trusted Original line — formerly marketed under the Perfect Circle brand — these rings are trusted by professional engine builders and automotive technicians for over 100 years.

Key Features:

• High tensile and yield strength with excellent hardness and low ring mass for superior stress resistance and long service life
• Minimal groove pound-out for extended durability under sustained engine loads
• Excellent cylinder wall conformability for consistent sealing across the bore
• Good blow-by control with low friction for improved oil economy and combustion efficiency
• OE-derived technology including narrow compression rings and low-tension oil rings developed through MAHLE's extensive OEM partnerships
• +0.040" oversize designation for use in bored or worn cylinders requiring oversized replacement rings

MAHLE is the world's largest manufacturer of piston rings, supplying over 60% of production engines built in North America. The Original line leverages MAHLE's deep OE engineering experience to deliver aftermarket rings that meet or exceed factory specifications, making them the ring of choice for engine rebuilds — from modern computer-controlled powerplants to classic engines.