Product Description
MAHLE S42170 is an OE-quality standard bore piston ring set for the 5.9L Cummins. Designed to meet OEM specs for sealing and oil control, this set restores compression and minimizes blow-by. Contains rings for a single cylinder—order quantity 6 for a complete engine.
- Application: Cummins 5.9L B-Series (12V & 24V)
- Bore Size: 4.016" (Standard)
- Ring Type Code: RBT-10
- Typical materials: chrome/ceramic-faced top ring, Napier-style second, CP-20 style oil control
- GTIN/UPC: 027067878311
Fitment
- 1989–2007 Dodge Ram 2500 / 3500 with 5.9L Cummins (12-valve & 24-valve). Note: XDP’s listing shows 2004.5–2007; many catalogs list 1989–2007—verify by piston/bore before ordering.
Cross Reference Numbers
- Cummins: 4089258, 4089460, 3804979, 3947678, 3959079
- MAHLE/Clevite: S42170 (std), oversizes available (e.g., S42170.020, .030, etc.)
What’s Included
One (1) standard-size ring set for one piston (top, second, and oil ring assembly). Order six sets for a full engine.
FAQ
Does this kit fit my 5.9L Cummins?
Yes for standard 4.016" bore pistons. Many catalogs cover 1989–2007 5.9L; XDP lists 2004.5–2007. Check your piston/bore size and ring land style to confirm.
How many do I need?
Each S42170 services one cylinder. Order 6 for a complete engine.
Are these performance rings?
They’re OE-spec rings focused on durability, sealing, and oil control—ideal for stock and mild builds.
Do I need to gap the rings?
Yes. Always file-fit to the engine builder’s spec based on bore, intended use, and boost.
What oversizes exist?
Common oversizes include .020", .030", .040", .050" (e.g., S42170.020). Match to your overbore.
