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GM 12701592 Duramax L5P Engine Oil Cooler Assembly 2020-2021

12701592 - 8C
Was: $422.39
Sale: $315.00
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This is a genuine GM OEM Duramax Diesel L5P Engine Oil Cooler Assembly.

The Duramax engine oil cooler is not normally a component that goes bad, however, it should be replaced after any catastrophic engine failure or during any performance engine builds.

The factory oil cooler has a stack plate design which makes cleaning any debris out nearly impossible. This is the reason we always recommend replacing the oil cooler. A defective engine oil cooler is also a major source for coolant/oil cross contamination. Check your coolant degas bottle for a layer of oil. If any appears, it is often defective oil cooler.

This coolers massive 30% increase in cooling capacity makes it a great upgrade for 2001-2016 trucks. Some changes will be required to install on earlier trucks.

  • Trimming of Drivers Side Exhaust Manifold Heat Shield and Heat Shield Mounting Boss
  • Replace Original Elbow with Coolant Elbow 12675428 and Gaskets 12676826 / 97192667
  • Cooler Mounting Requires (3) M8-1.25x40mm Bolts and (2) M8-1.25x120mm Bolts

For a upgrade that require less modification, DHD uses the 2017-2019 Cooler Part Number 12678318. The 17-19 cooler fits with only minor hardware changes and still cools substantially better then the earlier coolers.


2020-2021 L5P Duramax 6.6L 2500/3500 Silverado/Sierra

Note: Gaskets Not Included

Shipping Information

  • Item Requires Shipping
  • 16.0 lbs.
  • W11.0000” x H11.0000” x L10.0000”
  • Free Shipping

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