GM High-Flow Oil Cooler Upgrade Kit 2001–2019 Duramax Diesel LB7 LLY LBZ LML L5P

Upgrade your Duramax diesel with BackWoods Diesel’s High-Flow Engine Oil Cooler Kit – engineered to reduce oil temperatures by 10–25°F under both unloaded and towing conditions. Whether you're daily driving, towing, or running higher horsepower, this kit is designed to maximize oil cooling efficiency and long-term engine health.

Performance Benefits:
- 10–15°F reduction in oil temps daily driving
- 25°F peak oil temp reduction while towing
- 22% greater heat rejection at factory HP levels vs older L5P cooler
- 31% better cooling at 600HP / 3300 RPM
- 35–89% more surface area than factory units
- Bolt-on upgrade for most Duramax engines

What’s Included:
- OEM GM 2020+ L5P Max-Flow Oil Cooler
- GM Oil Cooler Adapter & Hardware
- GM Cooler Gasket & Adapter Gaskets
- PPE 114000740 Premium High-Efficiency 5 Micron Oil Filter
- GM O-ring & Pipe Gaskets
- Grade 10.9 Zinc Plated Hardware Kit
- Everything needed for a complete install

Fitment:
2001–2007 Chevy/GMC 2500HD & 3500HD (LB7, LLY, LBZ)
2011–2016 Chevy/GMC 2500HD & 3500HD (LML)
2017–2019 Chevy/GMC 2500HD & 3500HD (L5P)
**Will NOT fit 2007.5–2010 LMM due to EGR cooler interference**

Why Replace Your Factory Cooler?
Factory oil coolers trap debris and are nearly impossible to clean after engine failure. This upgraded unit not only improves cooling but also protects against future contamination and breakdown under high load or towing situations.

SHIPPING IS FREE via UPS or FedEx Ground to the lower 48 US states.

Alaska, Hawaii, Puerto Rico, Guam, APO/FPO addresses will need to email for a shipping quote.

CANADA, MEXICO, & ALL INTERNATIONAL BUYERS WILL NEED TO USE THE eBay GSP (GLOBAL SHIPPING PROGRAM)

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