5.9 Cummins Piston Ring Set – Standard Bore | Clevite / MAHLE S42221

Restore proper compression and oil control to your 5.9L Cummins with the Clevite (MAHLE) S42221 standard bore piston ring set. These premium OE-quality rings are built as a direct factory replacement for 1989–2002 Dodge Ram 2500/3500 trucks with the 5.9 Cummins (both 12-valve 6BT and 24-valve ISB engines).

Engineered to original equipment specifications, the S42221 features a ceramic chrome-faced top ring for excellent wear resistance and heat management, along with durable cast iron second and oil control rings. The result is reliable sealing, reduced oil consumption, and long service life under the demanding conditions these engines see every day.

Key Features

• Premium MAHLE Clevite OE-quality construction
• Ceramic chrome top ring for superior durability
• Standard bore (≈ 4.015–4.016")
• Direct factory replacement – no modifications required
• Maintains factory compression and oil control
• Ideal for stock rebuilds and ring replacements

Fitment

1989–2002 Dodge Ram 2500 / 3500 with 5.9L Cummins (12-valve & 24-valve)

Important Notes

• Contains rings for one cylinder only
• Order quantity of 6 for a complete engine set
• Always verify actual bore size, hone finish, and file-fit ring end gaps to specification before installation

A proven, high-quality choice for keeping your 5.9 Cummins running strong.