Product Description
MAHLE S42170.020 (.020 over) piston ring set for the 5.9L Cummins. OE-quality materials and factory-spec geometry help restore compression and control oil after an overbore. Contains rings for a single cylinder — order quantity 6 for a complete engine.
- Engine: 5.9L Cummins B/ISB (12-valve & 24-valve)
- Oversize: +0.020 in (4.035" bore)
- Construction: Cast iron top/second rings with chrome face; 3-piece oil ring
- Intended use: Stock replacement / rebuilds after machine overbore
Fitment
- 1989–1993 Dodge D/W 250/350 5.9L Cummins (6BT)
- 1994–1998 Ram 2500/3500 5.9L Cummins (12V)
- 1998.5–2002 Ram 2500/3500 5.9L Cummins (24V VP44)
- 2003–2007 Ram 2500/3500 5.9L Cummins (24V Common Rail)
Cross Reference / IDs
- MPN: S42170020 (aka S42170-020)
- UPC/GTIN: 027067878328
What’s Included
Ring pack for one cylinder (.020" over): top ring, second ring, oil ring assembly.
FAQ
Do I need 1 or 6 sets?
Each S42170.020 is for a single cylinder. Order 6 to service a complete 6-cyl engine.
Will these fit my year?
Yes, they fit 5.9L Cummins across 1989–2007 (12V, 24V VP44, and 24V Common Rail) when the cylinder is bored .020" over.
Are these performance rings?
They’re OE-quality replacements designed to meet stock specs and restore sealing after an overbore.
Top ring material & coating?
Cast iron with chrome face per Mahle spec for durability and wear resistance.
Machine work required?
Yes. These are .020" oversize rings; use only with properly bored and honed cylinders, and set end gaps per spec.
