Mahle 41909.020 Engine Piston Ring Set

Overview

MAHLE piston ring set 41909.020 is a premium oversize engine ring set built for specific GM heavy-duty truck and van applications. It uses low-friction ring technology and OE-driven engineering to help control oil consumption and support long service life.

Compatible with Chevrolet Silverado 2500 HD, Chevrolet Silverado 3500, GMC Sierra 2500 HD, and GMC Sierra 3500 applications, this set also covers Express, Savana, Kodiak, Topkick, and H1 fitments listed below. Part number 41909.020 is specified as a 0.020 in oversize set with a 4.0748 in bore diameter.

Key Features

• Premium engine piston ring set for oversize rebuild applications
• Plasma-Moly face coating for reduced friction at the ring face
• Ductile iron top ring and cast iron second ring construction
• Oil ring assembly material specified as GNS
• Engineered to reduce oil consumption and support longer service life
• Part number 41909.020 for fitment verification

Detailed Description

MAHLE 41909.020 is a premium piston ring set for engines requiring a 0.020 in oversize bore. The ring package combines a ductile iron top ring, cast iron second ring, and a Plasma-Moly coated face to balance sealing performance, wear resistance, and friction control. The listed bore diameter is 4.0748 in, making this set appropriate for rebuild work where cylinder dimensions have been machined to oversize specifications.

MAHLE develops piston rings around OE requirements, and this product reflects that approach with materials and coatings selected to help minimize oil use while maintaining durability. It is a strong match for Chevrolet Silverado 2500 HD and GMC Sierra 2500 HD rebuilds, as well as other Chevrolet and GMC heavy-duty applications shown in the fitment table. Part number 41909.020 should be matched carefully to engine bore size before installation.

What It Helps Address

• Excessive oil consumption from worn ring packs
• Loss of cylinder sealing during engine rebuilds
• Compression issues caused by ring wear
• Friction-related wear in high-load engine service
• Oversize rebuild requirements after cylinder machining

Installation Notes

Verify bore size, ring end gap, and cylinder finish before assembly. This is an oversize 0.020 in ring set, so it must be used only with matching machined cylinders. Follow the engine builder’s service specifications for ring orientation, gap placement, and break-in procedure. Confirm fitment by vehicle application and part number 41909.020 before ordering.

Quality Assurance

MAHLE states that its piston rings are developed to OE requirements and built around advanced ring technology for reduced friction, controlled oil use, and extended service life.