Mahle OE Moly Ring Set

2007–2017 Dodge Ram 2500 / 3500 5.7L Hemi, 5.9L Diesel, 6.4L 392, 6.7L Diesel

Part #: 42140.040

Overview

The Mahle OE Moly Ring Set is engineered to meet and exceed original equipment standards for piston rings, delivering superior performance and durability for Dodge Ram trucks equipped with various engines from 2007 through 2017. Designed specifically for heavy-duty applications including Cummins 6.7L diesel and Hemi V8 engines, these piston rings reduce friction and minimize oil consumption, helping to extend engine life and maintain optimal compression.

Ideal for professional mechanics, diesel enthusiasts, and fleet operators, this ring set ensures reliable sealing and efficient combustion, making it a trusted choice for engine rebuilds and repairs. Mahle’s advanced technology supports long service intervals and consistent engine performance under demanding conditions.

Key Features

Mahle OE piston rings incorporate the latest advancements in piston ring technology to deliver outstanding results:

• OE-driven design for precise fit and function on Dodge Ram 5.7L Hemi, 5.9L Diesel, 6.4L 392, and 6.7L Cummins Diesel engines
• Molybdenum coating reduces friction and wear for improved ring life
• Optimized ring mass lowers reciprocating weight, enhancing engine efficiency
• Superior oil control minimizes engine oil consumption and emissions
• Enhanced sealing properties maintain compression and reduce blow-by gases
• Manufactured to strict quality standards for consistent performance and durability
• Compatible with both gasoline and diesel engine applications within specified fitment

Construction & Design

Mahle OE piston rings are crafted from high-grade steel alloys and feature a molybdenum coating that provides exceptional wear resistance and low friction characteristics. This coating ensures smooth operation within the cylinder bore, reducing metal-to-metal contact and extending the lifespan of both the rings and cylinder walls. The rings are precision-machined to tight tolerances, guaranteeing a perfect fit and optimal sealing performance.

The design balances durability with lightweight construction to reduce the overall mass of the piston assembly, contributing to improved engine responsiveness and fuel efficiency. Each ring undergoes rigorous testing to meet or exceed OEM specifications, ensuring reliable performance in both diesel and gasoline-powered Dodge Ram engines.

Installation & Fitment

The Mahle OE Moly Ring Set is a direct replacement for factory piston rings on Dodge Ram 2500 and 3500 models from 2007 to 2017, covering engines including the 5.7L Hemi, 5.9L Diesel, 6.4L 392, and 6.7L Cummins Diesel. Installation requires standard engine rebuild procedures and should be performed by a qualified technician to ensure proper ring end gap and seating.

No modifications are necessary as these rings are designed to meet exact OEM specifications, providing a straightforward installation process and reliable engine performance after rebuild.

What's Included

• Complete set of molybdenum-coated piston rings tailored for specified Dodge Ram engines
• Compression rings and oil control rings as per original equipment design
• Packaging and instructions for proper installation

Ideal For

This piston ring set is ideal for:

• Engine rebuilders and mechanics servicing Dodge Ram 2500 and 3500 trucks
• Owners of Cummins 6.7L diesel engines seeking durable, OE-quality replacement parts
• Performance enthusiasts requiring reliable sealing and reduced oil consumption
• Fleet operators maintaining heavy-duty diesel and gasoline-powered Dodge Ram trucks
• Anyone looking to restore engine compression and improve longevity during rebuilds

MAHLE Aftermarket supplies a broad range of OE-quality engine and service components—engine parts, filters, gaskets, and thermal management—supporting everything from stock maintenance to performance-minded rebuilds. It’s a trusted source when builders want reputable engineering and consistent quality for refreshes, reliability upgrades, and daily-driven performance projects.