Mahle 41555CP.040 Engine Piston Ring Set

Engine Piston Ring Set Overview

This Mahle engine piston ring set is built for 3.662-inch bores and 0.040-inch oversize applications. It combines premium ring materials with a plasma-moly face coating to support controlled oil use and reduced friction in service.

Compatible with select Buick Skylark, Chevrolet Cavalier, Oldsmobile Achieva, Pontiac Grand Am, and related GM compact and midsize engines listed below, this part number 41555CP.040 is specified for rebuild work where ring fit and material selection matter. The 41555CP.040 also cross-references Hastings Piston Rings 2M4468040 and Sealed Power E535K100MM for the same application.

Key Features

• 3.662-inch bore diameter with 0.040-inch oversize sizing
• Plasma-moly piston ring face coating for reduced friction
• Ductile iron top ring, cast iron second ring, and stainless steel oil ring assembly
• Shallow-groove oil ring assembly design
• Premium-grade construction for engine rebuild applications

Detailed Description

Mahle piston rings are engineered around OE requirements and focus on friction reduction, lower ring mass, and oil control. The top ring uses ductile iron, the second ring uses cast iron, and the oil ring assembly uses stainless steel, with a shallow groove design and 3.00 mm axial height for the oil ring assembly. The plasma-moly face coating adds a wear-resistant surface that supports consistent sealing during engine operation. Part number 41555CP.040 is a fitment-specific choice for rebuilds that require the listed bore and oversize dimensions.

What This Part Helps Address

• Excessive oil consumption from worn or out-of-spec rings
• Loss of cylinder sealing during engine rebuilds
• Friction-related wear in the ring pack
• Compression loss caused by ring wear or damage
• Incorrect ring sizing for 0.040-inch oversize bores

Installation Notes and Tips

Verify bore diameter, oversize requirement, and ring groove dimensions before installation. Match the ring pack to the engine specification shown in the fitment data, and confirm the shallow-groove oil ring assembly requirement during assembly. Professional engine machine work and careful ring end-gap setup are recommended for rebuild accuracy.

Quality Assurance

Mahle positions this ring set as a premium component developed to meet OE-driven performance requirements. The 41555CP.040 is built with materials and coatings selected for friction control, oil management, and service life in engine rebuild applications.