Mahle 42155CP.020 Engine Piston Ring Set

Mahle 42155CP.020 Piston Ring Set

Mahle 42155CP.020 is a premium engine piston ring set built for 3.7992 in bore applications with a 0.020 in oversize. It uses a plasma-moly face coating on the top ring to support reduced friction and controlled oil use, while the ring package is sized for shallow groove applications.

Key Features

• Part number 42155CP.020 for engine rebuild and cylinder block service
• 3.7992 in bore diameter with 0.020 in oversize
• Top ring material: carbon steel with plasma-moly face coating
• Second ring material: cast iron
• Oil ring assembly material: stainless steel
• Premium item grade for OE-style engine service
• Shallow groove ring design

Product Details

Mahle piston rings are engineered around OE requirements, with attention to friction control, ring mass, oil consumption, and service life. This 42155CP.020 set is specified with a 0.0468 in top ring thickness, 0.0468 in second ring thickness, and 0.0787 in oil ring assembly thickness. The combination of carbon steel, cast iron, and stainless steel materials supports stable sealing performance in rebuilt engines that require an oversize ring package.

Compatible With 2011-2017 Chrysler 200, 2011-2017 Chrysler 300, 2011-2017 Dodge Challenger, 2011-2017 Dodge Charger, 2011-2017 Dodge Grand Caravan, 2011-2017 Dodge Journey, 2012-2017 Jeep Wrangler, 2013-2017 Ram 1500, 2014-2017 Ram ProMaster 1500, 2014-2017 Ram ProMaster 2500, 2014-2017 Ram ProMaster 3500, 2011-2016 Chrysler Town & Country, 2011-2016 Jeep Grand Cherokee, 2011-2015 Dodge Durango, 2012-2015 Ram C/V, and 2011-2014 Dodge Avenger. This part number 42155CP.020 is also referenced for Chrysler 300 and Dodge Charger engine rebuild applications where the listed shallow groove specification is required.

Common Uses

• Restoring cylinder sealing after engine wear or rebuild machining
• Addressing oil control concerns tied to worn piston rings
• Replacing rings during overbore service with 0.020 in oversize pistons
• Supporting compression recovery in high-mileage engines
• Servicing OE-style rebuilds on Chrysler, Dodge, Jeep, and Ram engines

Installation Notes

Verify bore size, piston groove dimensions, and oversize requirements before installation. Measure ring end gap and follow the engine builder’s specifications for filing, orientation, and break-in procedure. Confirm that the shallow groove ring profile matches the piston design before assembly. Part number 42155CP.020 should be installed only in applications listed by the fitment data.

Quality Assurance

Mahle manufactures piston rings to meet OE-driven performance targets, with emphasis on reduced friction, lower oil consumption, and long service life. The premium construction and material selection reflect Mahle’s focus on modern ring technology for engine rebuild applications.