Product Description
Refresh compression and oil control on your LB7/LLY/LBZ/LMM with the MAHLE 41909.03 +.030" Piston Ring Set for the 2001–2010 GM 6.6L Duramax. This complete 8-cylinder ring kit delivers OE-grade sealing with pre-lapped, standard-tension plasma-moly top rings engineered for fast seat-in and long service life.
Fitment
- 2001–2010 Chevrolet Silverado/GMC Sierra 2500HD & 3500HD — 6.6L Duramax (LB7, LLY, LBZ, LMM)
- Also used across compatible 6.6L platforms in this era; verify bore & oversize before ordering.
Cross-Reference / Alternatives (Mahle only)
- Mahle 41909 Piston Ring Set (STD): 41909 (STD)
- Mahle S41909 Piston Ring Set (STD): S41909 (STD)
- Mahle 41909.01 Piston Ring Set (.010): 41909.01
- Mahle 41909.02 Piston Ring Set (.020): 41909.02
- Mahle 41909.04 Piston Ring Set (.040): 41909.04
What’s Included
- Complete 8-cylinder ring set: (8) top rings, (8) second rings, (8) oil ring assemblies
Why Buy From CPP Diesel
- Fast, diesel-focused shipping & support
- Curated Mahle coverage for Duramax rebuilds
FAQ
Is this a full engine set?
Yes—41909.03 is a complete set for all eight cylinders.
What bore size corresponds to +.030"?
Approximately 4.085" (103.76 mm). Always verify final hone size and ring end-gaps.
Are the rings pre-lapped?
Yes—pre-lapped, standard-tension rings for quick seat-in when bores are finished correctly.
Will these fit LB7, LLY, LBZ, and LMM?
Yes—2001–2010 6.6L Duramax (LB7/LLY/LBZ/LMM). Confirm your oversize before purchase.
Specifications for Mahle 41909.03
| Attribute | Value |
|---|---|
| Brand | Mahle |
| Part Number | 41909.03 |
| UPC | 027067460813 |
| GTIN | 027067460813 |
| Bore / Oversize | 4.085" (+.030") |
| Ring Widths | 3.0 mm (top) / 2.0 mm (second) / 3.0 mm (oil) |
| Materials / Faces | Top: ductile iron, plasma-moly face; Second: cast iron; Oil rails: stainless/gas-nitride |
| Configuration | Complete 8-cylinder set |
| Shipping | Free Shipping |
| Prop 65 | See www.P65Warnings.ca.gov. |
