MAHLE 41458CP.030 Premium Plasma-Moly Engine Piston Ring Set Oversize - 0.030

The MAHLE 41458CP.030 is a premium plasma-moly piston ring set engineered to OE standards for reliable engine rebuilding. Sized at +0.030" oversize, this set is designed for bored engines requiring precise ring-to-bore fitment during a rebuild or overhaul.

MAHLE Original piston ring sets are designed to be installer-friendly — they are pre-lapped to seat immediately, virtually eliminating break-in time. Ring materials, coatings, and tension levels are all optimized for reduced friction and extended service life.

Key Features:

• Plasma-Moly Top Ring: Compression rings feature a barrel-faced contact area for more efficient sealing and a CNC-controlled gap chamfer to optimize compression and reduce blow-by
• Reverse Twist Intermediate Ring: Intermediate (second) rings use a reverse twist design for superior groove side sealing, with taper-face machining to enhance cylinder wall contact
• CP-20 Oil Ring Assembly: Features an exclusive 20-degree ear angle for maximum side sealing against the cylinder wall; the chemically polished oil ring expander promotes enhanced oil drain-back
• +0.030" Oversize: Engineered for cylinders bored 0.030 inches over standard diameter
• Pre-Lapped: Ready to install with minimal break-in required
• OE-Quality Materials: Ring materials and coatings meet or exceed original equipment specifications

MAHLE is a globally recognized OE supplier to major automotive manufacturers, and their aftermarket piston ring sets deliver the same engineering excellence trusted by professional engine builders worldwide.