Fleece Oil Cooler Adapter O-ring Kit (FPE-DMAX-OCADPT-ORING-KIT) for 2001-2016 Duramax LB7 / LLY / LBZ / LML

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The Fleece Oil Cooler Adapter O-ring Kit (FPE-DMAX-OCADPT-ORING-KIT) is a durable, OEM-compatible replacement kit by Fleece Performance Engineering, designed for 2001–2016 GM Duramax diesel engines (LB7, LLY, LBZ, LML). It includes all necessary O-rings to reseal the oil cooler adapter, helping prevent oil leaks and maintain engine performance—ideal for routine maintenance or oil cooler servicing.

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Description

The Fleece Oil Cooler Adapter O-ring Kit (FPE-DMAX-OCADPT-ORING-KIT) is a high-quality replacement kit designed specifically for 2001–2016 GM Duramax diesel engines, including the LB7, LLY, LBZ, and LML models. Manufactured by Fleece Performance Engineering, this kit includes all the necessary O-rings required to reseal the oil cooler adapter, ensuring a secure fit and preventing oil leaks that can compromise engine performance. Ideal for routine maintenance or during oil cooler servicing, the kit is engineered for durability and compatibility with OEM components, making it a reliable choice for Duramax owners looking to maintain optimal engine function and longevity.

Additional information
Weight 1.0 lbs
Dimensions 6.0 × 4.0 × 1.0 in
Fitment

Fitment

  • 2001 GM Silverado/Sierra 2500/3500 6.6L LB7 Duramax
  • 2002 GM Silverado/Sierra 2500/3500 6.6L LB7 Duramax
  • 2003 GM Silverado/Sierra 2500/3500 6.6L LB7 Duramax
  • 2004 GM Silverado/Sierra 2500/3500 6.6L LB7 Duramax
  • 2004.5 GM Silverado/Sierra 2500/3500 6.6L LLY Duramax
  • 2005 GM Silverado/Sierra 2500/3500 6.6L LLY Duramax
  • 2006 GM Silverado/Sierra 2500/3500 6.6L LLY/LBZ Duramax
  • 2007 GM Silverado/Sierra 2500/3500 6.6L LLY/LBZ Duramax (classic body style)
  • 2011 GM Silverado/Sierra 2500/3500 6.6L LML Duramax
  • 2012 GM Silverado/Sierra 2500/3500 6.6L LML Duramax
  • 2013 GM Silverado/Sierra 2500/3500 6.6L LML Duramax
  • 2014 GM Silverado/Sierra 2500/3500 6.6L LML Duramax
  • 2015 GM Silverado/Sierra 2500/3500 6.6L LML Duramax
  • 2016 GM Silverado/Sierra 2500/3500 6.6L LML Duramax
Installation

Installation

Replacement O-ring kit for Fleece Performance Duramax Oil Cooler Adapter, FPE-DMAX-OCADPT.

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About brand
Fleece Performance Engineering is a diesel performance manufacturer focused on reliability and precision engineering. The company designs parts that solve common diesel issues while supporting added power. Fleece products support daily driving, towing, and performance diesel trucks. Fleece engineers fuel system components, turbochargers, electronics, and emissions-compliant upgrades in house. Their parts improve efficiency, drivability, and long-term engine protection. Each product is tested for proper fit and consistent performance. Diesel owners trust Fleece for dependable upgrades. Whether maintaining a work truck or building for performance, Fleece delivers proven solutions designed for real-world use.
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