Duramax Oil Cooler Adapter

Features:

• Fixes common Duramax oil leaks
• Integral square cut seal design
• Eliminates factory metal gasket
• Provides improved long term sealing
• Reduces oil cooler flex leaks
• Direct bolt-on replacement
• Slotted holes ease installation
• OEM fit and factory alignment
• Fits 2001-2019 Duramax engines
• Replaces GM oil adapter numbers
• High quality Fleece Performance construction
• One year limited warranty

A Simple Upgrade That Puts An End To Oil Leaks

If you have owned a Duramax long enough, you know how frustrating oil cooler leaks can be once they start. The factory adapter relies on a thin metal gasket that eventually gives up as the oil cooler flexes with heat cycles and vibration. Fleece Performance designed this oil cooler adapter to eliminate that weak point and restore confidence under the hood. The integrated square cut seal provides a far more reliable seal that holds up over time, even on high mileage or hard working trucks. Additionally, the adapter installs as a direct replacement, so there is no guesswork or custom fitting involved. Slotted mounting holes make alignment easier during installation, saving time and reducing frustration. It is a smart upgrade for anyone who wants to fix the problem once instead of chasing recurring leaks.

Engineered To Improve Sealing On Duramax Oil Coolers

From a technical standpoint, this Fleece Performance oil cooler adapter is designed to address a known failure point in the Duramax oiling system. Rather than relying on a separate metal gasket, the adapter uses an integral square cut seal ring at the oil cooler mating surface. This design helps maintain consistent sealing pressure as the cooler expands and contracts during normal engine operation. Furthermore, the adapter is machined to bolt directly in place of the factory unit and replaces GM part numbers 97941206 and 12684475. It is compatible with 2001-2007 and 2011-2019 6.6L Duramax engines, making it a versatile solution across multiple generations. The slotted mounting holes allow for slight adjustment, which helps ensure proper fitment and reduces installation issues. Backed by a one year limited warranty, this adapter offers a practical and long lasting improvement over the original design.

Fitment: 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LB7

Notes:

• Designed to fix a known factory oil cooler leak issue.
• Replaces the factory metal gasket with a sealed adapter.
• Uses an integrated square cut seal ring.
• Direct replacement for specific GM oil adapters.
• Compatible with select Duramax model years only.
• Fits 2001-2007 and 2011-2019 engines.
• Slotted mounting holes aid installation alignment.
• No additional sealing gasket required.
• Intended as a permanent leak prevention solution.
• Ideal for high mileage or leaking engines.
• Includes one year limited parts warranty.
• prop 65 warning label.
• Professional installation recommended for best results.

Install Instructions