Mahle 41859CP.020 Engine Piston Ring Set

Engine Piston Ring Set Overview

MAHLE 41859CP.020 is a premium oversize engine piston ring set built for 3.800-inch bore applications. It uses a plasma-moly face coating, carbon steel top and second rings, and a stainless steel oil ring assembly to support controlled oil use and reduced friction.

Key Features

• 0.020 in oversize for matched rebuild applications
• 3.800-inch bore diameter specification
• Plasma-moly ring face coating for wear resistance
• Carbon steel top and second rings for strength and stability
• Stainless steel oil ring assembly with shallow groove design
• Premium grade construction for engine rebuild service

Detailed Description

MAHLE 41859CP.020 piston rings are engineered around OE-level requirements for friction control, oil consumption management, and service life. The ring set combines a plasma-moly coated face with carbon steel compression rings and a stainless steel oil control assembly, giving it the material mix commonly specified for durable rebuild work. This part number, 41859CP.020, is listed for a wide range of Chevrolet, GMC, and related applications, including Chevrolet Silverado 1500, GMC Sierra 1500, and Chevrolet Tahoe fitments. It is also cross-referenced to Hastings Piston Rings 2M4978020 and Sealed Power E937K50MM for the same application.

What It Is Used For

• Restoring cylinder sealing after engine wear
• Reducing oil consumption caused by worn rings
• Improving compression retention during rebuilds
• Replacing oversized rings in 3.800-inch bore engines
• Addressing blow-by and related drivability issues

Installation Notes and Tips

Verify bore size, ring oversize, and groove dimensions before assembly. This set is specified for 0.020 in oversize use and a shallow groove oil ring design, so piston and cylinder measurements should match the engine build plan. Confirm the correct application by vehicle, engine, and rebuild specification before installation on Chevrolet Silverado 1500, GMC Sierra 1500, or other listed platforms.

Quality Assurance

MAHLE positions this ring set within its OE-driven piston ring program, with emphasis on reduced friction, lower ring mass, and longer service life. The 41859CP.020 part number reflects a premium-grade component intended for precision engine rebuild work.