MAHLE 41935CP.040 Engine Piston Ring Set +0.040" Oversize Plasma-Moly

The MAHLE 41935CP.040 is a premium plasma-moly piston ring set in a +0.040" oversize bore specification, engineered for engine rebuilds and overhaul applications. MAHLE is the world's largest manufacturer of piston rings, with deep OE development roots that carry directly into their aftermarket Original line.

The "CP" designation identifies this as part of MAHLE's plasma-moly compression ring series — featuring a barrel-faced contact area for efficient compression sealing and a CNC-controlled gap chamfer designed to optimize compression and reduce blow-by. These rings are pre-lapped from the factory to seat immediately, virtually eliminating traditional break-in time.

Key Features:

• Plasma-moly face coating on top compression ring for reduced friction and extended service life
• +0.040" oversize bore for worn or bored cylinder applications
• Pre-lapped rings seat immediately — minimal break-in time required
• Reverse twist intermediate ring design for superior groove side sealing
• CP-20 oil ring assembly with 20-degree ear angle for optimal cylinder wall side sealing
• Chemically polished oil ring expander for enhanced oil drain back
• Ring tension, materials, and coatings optimized per application for reduced friction
• OEM-level quality engineered by the world's leading piston ring manufacturer

MAHLE Original piston ring sets carry over 100 years of engineering trust, formerly marketed under the Perfect Circle brand. The 41935CP.040 is a reliable choice for professional engine builders performing overhaul or rebuild work requiring a +0.040" overbore ring set.