Clevite 41559CP030 MAHLE Engine Piston Ring Set 0.030 Over Plasma-Moly

The Clevite 41559CP030 is a MAHLE Original premium engine piston ring set sized 0.030" oversize, engineered to restore compression, reduce oil consumption, and extend engine service life. Manufactured under the combined MAHLE/Clevite brand, this ring set is built to OE specifications and designed for straightforward installation.

These rings are pre-lapped to seat immediately, virtually eliminating traditional break-in time. Ring materials, coatings, and tension are precisely optimized for reduced friction and long service life in each application.

Key Features:

• Upper Compression Ring (UCR): Carbon steel construction with Plasma-Moly facing; RF-13PF barrel-faced design with CNC-controlled gap chamfer for efficient compression and reduced blow-by
• Lower Compression Ring (LCR): Carbon steel with reverse twist (THM-13) design for superior groove side sealing and taper race machining to enhance cylinder wall contact
• Oil Control Ring (OCR): Stainless steel with Chrome facing; CP-20 Shallow Groove assembly featuring an exclusive 20-degree ear angle for optimal cylinder wall side sealing, plus a special chemical polish on the expander for enhanced oil drain-back
• Ring Thickness: UCR — 1.5mm | LCR — 1.5mm | OCR — 3.0mm
• Oversize: +0.030 in. (0.762mm)
• Standard tension oil rings for factory-compatible ring pack pressure

MAHLE Original piston rings are driven by OE development requirements — reducing friction and ring mass while minimizing oil consumption and delivering longer service life. The Clevite 41559CP030 piston ring set is the trusted choice of professional engine builders for rebuilds and performance applications alike.