Mahle 42157CP Engine Piston Ring Set

Mahle 42157CP Engine Piston Ring Set

Mahle 42157CP is a premium engine piston ring set built for OE-style performance, low friction, and controlled oil consumption. It uses a carbon steel top ring, cast iron second ring, and stainless steel oil ring assembly with Plasma-Moly face coating for durable sealing in demanding truck and SUV applications.

Key Features

• Part number 42157CP piston ring set for standard bore applications
• 4.0011 in bore diameter with shallow groove sizing
• Top ring material: carbon steel with 0.0468 in axial height
• Second ring material: cast iron with 0.0586 in axial height
• Oil ring assembly material: stainless steel with 0.0984 in axial height
• Plasma-Moly piston ring face coating for improved wear resistance
• Premium item grade for rebuilds that require precise ring fitment

Detailed Description

Mahle 42157CP piston rings are engineered for engines that need accurate cylinder sealing, stable oil control, and reduced friction under load. The ring package combines a carbon steel top ring, cast iron second ring, and stainless steel oil ring assembly to match the demands of GM truck and SUV engines. This set is a strong choice for Chevrolet Silverado 1500, Silverado 2500 HD, Silverado 3500 HD, GMC Sierra 1500, Sierra 2500 HD, and related applications where standard bore dimensions and shallow groove ring sizing are required. This part number 42157CP also cross-references Hastings Piston Rings 2M5170 for the same application.

Vehicle Fitment

• Fits 2010-2017 Chevrolet Express 2500, N/A
• Fits 2010-2017 Chevrolet Express 3500, N/A
• Fits 2010-2017 Chevrolet Silverado 2500 HD, N/A
• Fits 2015-2017 Chevrolet Silverado 3500, N/A
• Fits 2013 Chevrolet Silverado 3500, N/A
• Fits 2010-2017 Chevrolet Silverado 3500 HD, N/A
• Fits 2010-2017 GMC Savana 2500, N/A
• Fits 2010-2017 GMC Savana 3500, N/A
• Fits 2010-2017 GMC Sierra 2500 HD, N/A
• Fits 2010-2017 GMC Sierra 3500 HD, N/A
• Fits 2011-2015 Chevrolet Caprice, N/A
• Fits 2012-2013 Cadillac Escalade, N/A
• Fits 2012-2013 Chevrolet Silverado 1500, N/A
• Fits 2009-2013 Chevrolet Suburban 2500, N/A
• Fits 2012-2013 Chevrolet Tahoe, N/A
• Fits 2012-2013 GMC Sierra 1500, N/A
• Fits 2012-2013 GMC Yukon, N/A
• Fits 2010-2013 GMC Yukon XL 2500, N/A
• Fits 2007 Chevrolet Silverado 1500 HD Classic, N/A

What It Helps Address

• Oil consumption caused by worn or incorrect piston rings
• Loss of compression from ring wear or poor cylinder sealing
• Excess blow-by that can affect crankcase pressure
• Reduced ring control in high-mileage rebuilds
• Mismatch issues when rebuilding engines that require shallow groove rings

Installation Notes

Verify bore diameter, ring groove depth, and ring end gap before assembly. Confirm the engine uses the standard 4.0011 in bore and shallow groove configuration listed for this part number 42157CP. Clean the piston ring lands thoroughly and follow the engine builder’s ring gap and break-in procedures for the specific application.

Quality Assurance

Mahle piston rings are developed around OE requirements, with attention to reduced friction, lower ring mass, controlled oil use, and long service life. The 42157CP set reflects that engineering approach for GM truck, SUV, and performance sedan applications.