MAHLE 51845CP.040 Standard Piston Ring Set Oversize - 0.040

The MAHLE 51845CP.040 is a standard replacement piston ring set sized at 0.040" oversize, engineered to OEM-equivalent tolerances for reliable engine rebuilding and repair. As part of the MAHLE Original line — formerly known as Perfect Circle — this set carries over a century of piston ring development expertise trusted by professional engine builders and technicians worldwide.

MAHLE is the world's largest manufacturer of piston rings, supplying over 60% of production engines built in North America with MAHLE pistons or rings. The Original line benefits directly from MAHLE's deep OEM development relationships, bringing factory-grade engineering to the aftermarket.

Key Features:

• 0.040" Oversize bore — designed for cylinders bored or honed to 0.040" over standard diameter
• High tensile and yield strength with excellent hardness and low ring mass for reduced groove pound-out
• Superior cylinder conformability for effective sealing and reduced blow-by
• Low-friction design for improved oil economy and long service life
• OEM-derived technology — narrow compression rings, coated rings, and low-tension oil rings evolved from MAHLE's OE production experience
• Manufactured to precise dimensional tolerances for consistent gap and tension

The MAHLE Original 51845CP.040 piston ring set is the professional's choice for engine overhaul, delivering OE-quality fit and performance in an aftermarket package.