Mahle 42273CP.020 Engine Piston Ring Set

Overview

MAHLE 42273CP.020 is a premium engine piston ring set built for 3.9409-inch bore applications with a 0.020-inch oversize. It uses a plasma-moly face coating, carbon steel top ring, cast iron second ring, and stainless steel oil ring assembly to support controlled sealing and reduced friction in the cylinder block.

Compatible With 2014-2017 Chevrolet Silverado 1500 and 2014-2017 GMC Sierra 1500 engine applications, this MAHLE piston ring set is engineered to meet OE-driven requirements for ring mass, oil control, and service life. The shallow groove design and matched ring materials support precise cylinder sealing in performance-critical rebuild work.

Key Features

• Premium piston ring set for engine rebuild and repair work
• 0.020-inch oversize for compatible bored cylinders
• Plasma-moly face coating for improved wear resistance
• Carbon steel top ring, cast iron second ring, and stainless steel oil ring assembly
• Shallow groove design for the specified ring package
• MAHLE part number 42273CP.020 for application matching

Detailed Description

MAHLE 42273CP.020 piston rings are built around OE-focused engineering that emphasizes friction reduction, oil consumption control, and long service life. The ring package combines a carbon steel top ring, cast iron second ring, and stainless steel oil ring assembly, with a plasma-moly face coating to support durability under cylinder pressure and heat. This makes it a practical choice for engine service where ring sealing and oil control are critical.

For Chevrolet Silverado 1500 and GMC Sierra 1500 rebuild applications, the 3.9409-inch bore diameter and 0.020-inch oversize help match the cylinder specification after machining. The MAHLE 42273CP.020 designation should be verified against the engine build sheet and bore measurement before installation.

What It Helps Address

• Excessive oil consumption from worn ring sealing surfaces
• Low compression caused by ring wear or cylinder leakage
• Blow-by related to poor piston ring sealing
• Reduced cylinder control during engine rebuilds
• Wear issues in oversize bore service applications

Installation Notes

Confirm bore diameter, oversize requirement, and ring groove specification before assembly. Measure the cylinder after machining and verify the ring set matches the engine’s required shallow groove configuration. Clean ring lands and cylinder walls thoroughly, and follow the engine builder’s ring end-gap and break-in procedures.

Quality Assurance

MAHLE positions this ring set as a premium component developed around OE requirements. The design focuses on reduced friction, controlled oil use, and extended service life for rebuild applications.