MAHLE S41909 PISTON RING SET (STD) FOR 2001-2010 GM 6.6L DURAMAX ENGINE

The MAHLE S41909 is a premium piston ring set designed for the 2001–2010 GM 6.6L Duramax diesel engines, including LB7, LLY, LBZ, and LMM variants. This set is engineered to meet or exceed OEM specifications, ensuring reliable performance and durability for your engine rebuild or maintenance needs.

? Product Overview

• Part Number: S41909

• Engine Compatibility: 2001–2010 GM 6.6L Duramax (LB7, LLY, LBZ, LMM)

• Bore Diameter: 4.0551 inches

• Ring Materials:

  • Top Ring: Ductile Iron

  • Second Ring: Cast Iron

  • Oil Ring Assembly: Gas Nitride Steel (GNS)

• Ring Thickness:

  • Top Ring: 0.1181 inches

  • Second Ring: 0.0783 inches

  • Oil Ring Assembly: 0.1177 inches

• Coatings:

  • Top Ring: Plasma-Moly

  • Oil Ring Assembly: Gas Nitride

• Quantity: Set includes 32 rings (8 sets of 4 rings)

• Pre-Lapped: Yes, for immediate seating

? Vehicle Fitment

This piston ring set is compatible with the following GM models equipped with the 6.6L Duramax diesel engine:

• Chevrolet Silverado 2500HD/3500HD (2001–2010)

• GMC Sierra 2500HD/3500HD (2001–2010)

• Chevrolet Express 2500/3500 (2001–2010)

• GMC Savana 2500/3500 (2001–2010)

• Chevrolet Kodiak C4500/C5500 (2003–2009)

• GMC TopKick C4500/C5500 (2003–2009)

• Chevrolet Express 4500 (2009–2010)

• GMC Savana 4500 (2009)