Mahle 42089CP.030 Engine Piston Ring Set

Mahle 42089CP.030 Piston Ring Set

The Mahle 42089CP.030 engine piston ring set is a premium replacement for select Chrysler, Dodge, and Jeep 5.7L applications that require a 0.030 in oversize bore. Built around OE-driven engineering, it focuses on reduced friction, controlled oil consumption, and long service life for rebuilds that need precise ring sealing.

Key Features

• Part number 42089CP.030 for engine rebuild and overhaul work
• 0.030 in oversize with a 4.0846 in bore diameter
• Premium-grade ring set for shallow groove piston applications
• Top ring material: ductile iron with 0.0586 in axial height
• Second ring material: carbon steel with 0.0586 in axial height
• Oil ring assembly material: stainless steel with 0.1181 in axial height
• Plasma-Moly piston ring face coating for improved wear characteristics
• Cross-references Hastings Piston Rings 2M4907 for the same application

Detailed Description

Mahle 42089CP.030 is engineered for engines that need a precision piston ring set with OE-style material selection and coating technology. The combination of ductile iron, carbon steel, and stainless steel ring construction supports consistent sealing performance, while the Plasma-Moly face coating helps the rings handle demanding cylinder conditions during break-in and normal operation. This part number is a strong match for rebuilders working on Chrysler 300, Dodge Challenger, Dodge Charger, Dodge Magnum, and Jeep Grand Cherokee engines within the listed fitment range.

Compatible With 2005-2010 Chrysler 300, N/A; 2008-2010 Dodge Challenger, N/A; 2006-2010 Dodge Charger, N/A; 2006-2010 Jeep Grand Cherokee, N/A; and 2006-2008 Dodge Magnum, N/A. The 42089CP.030 piston ring set is intended for shallow groove piston configurations and 0.030 in oversize applications where accurate ring dimensions matter for compression control and oil management.

What It Helps Address

• Low compression caused by worn or out-of-spec piston rings
• Excessive oil consumption from tired ring sealing surfaces
• Blow-by related to poor cylinder sealing during engine wear
• Rebuild issues where shallow groove ring dimensions are required
• Wear concerns in engines needing a premium oversize ring set

Installation Notes and Tips

Verify bore size, piston groove dimensions, and ring end gap before assembly. This 42089CP.030 set is specified for a 4.0846 in bore and 0.030 in oversize use, so cylinder measurement should be confirmed during machine work. Clean ring lands thoroughly, follow the engine builder’s ring gap procedure, and match the ring set to the correct piston and cylinder finish before final assembly.

Quality Assurance

Mahle piston rings are developed around OE requirements with an emphasis on friction reduction, lower oil consumption, and extended service life. The 42089CP.030 reflects that engineering approach with premium materials and a wear-focused coating for rebuild accuracy and durability.