Mahle 42145CP Engine Piston Ring Set

Mahle 42145CP Piston Ring Set

Mahle 42145CP is a premium engine piston ring set built for precise cylinder sealing, controlled oil consumption, and reduced friction. It is engineered for shallow groove applications and matches OE-style ring materials and coatings used in late-model GM and Hummer 3.7L engines.

Compatible with 2007-2012 Chevrolet Colorado, 2007-2012 GMC Canyon, 2007-2010 Hummer H3, 2009-2010 Hummer H3T, and 2007-2008 Isuzu i-370, this piston ring set supports accurate rebuild work where bore size and ring profile matter. Mahle 42145CP is also a direct cross-reference to Hastings Piston Rings 2C5215 for the same application.

Key Features

• Part number: 42145CP
• Premium-grade engine piston ring set
• Bore diameter: 3.7598 in
• Standard oversize for OE-style service applications
• Top ring material: carbon steel with plasma-moly face coating
• Second ring material: cast iron
• Oil ring assembly material: stainless steel
• Shallow groove design
• Top ring thickness: 0.0468 in
• Second ring thickness: 0.0586 in
• Oil ring assembly thickness: 0.0984 in

Detailed Description

Mahle piston rings are developed around OE requirements, with attention to friction control, ring mass, oil management, and service life. This set uses a carbon steel top ring with plasma-moly facing for wear resistance, a cast iron second ring, and a stainless steel oil ring assembly to support stable sealing and oil control in the cylinder block. The shallow groove configuration and standard bore sizing make this set a strong match for rebuilds that need accurate ring fitment and consistent compression sealing.

Fits 2007-2012 Chevrolet Colorado, N/A; Fits 2007-2012 GMC Canyon, N/A; Fits 2007-2010 Hummer H3, N/A; Fits 2009-2010 Hummer H3T, N/A; Fits 2007-2008 Isuzu i-370, N/A. Search terms such as Mahle 42145CP piston ring set, Chevrolet Colorado piston rings, and GMC Canyon engine ring set align with this application.

What It Helps Address

• Low compression caused by worn or damaged piston rings
• Excessive oil consumption from ring wear or poor sealing
• Blow-by related to cylinder sealing loss
• Reduced ring control in high-mileage or rebuilt engines
• Inconsistent cylinder pressure during engine overhaul

Installation Notes and Tips

Verify bore diameter, ring groove dimensions, and ring end gap before assembly. Clean the piston ring grooves thoroughly and inspect cylinder walls for taper, scoring, or out-of-round conditions before installing the rings. Follow the engine builder’s service specifications for ring orientation, end-gap measurement, and break-in procedure to protect the plasma-moly face coating and promote proper seating.

Quality Assurance

Mahle manufactures piston rings to OE-focused standards with an emphasis on friction reduction, oil control, and long service life. The 42145CP is a premium engine piston ring set intended for accurate rebuild work in compatible Chevrolet Colorado, GMC Canyon, Hummer H3, Hummer H3T, and Isuzu i-370 applications.