Life time Warranty
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  • Fits 2017-2019 Chevrolet/GMC 6.6L Duramax
  • Substantial 25-percent increase in coolant capacity over stock radiator
  • 14-percent increase in total core volume over stock radiator
  • Strutted tubes throughout for maximum rigidity and durability
  • Louvered fins for improved heat dissipation
  • All-aluminum design with precision TIG-welded end tanks
  • Includes Mishimoto Magnetic Drain Plug to capture metallic debris within cooling system
  • Pair with Mishimoto Silicone Coolant Hose Kit for even greater cooling system protection
  • Patent pending
  • Mishimoto Lifetime Warranty


GM designed the 6.6L L5P Duramax around the lifestyle of their customers. Tough, dependable, and rugged. Unfortunately, the Duramax's plastic cooling components, specifically the radiator, don't exhibit the same attributes. Luckily, the Mishimoto engineering team has developed a robust radiator for your 2017-2019 Chevrolet/GMC 6.6L L5P Duramax. Our L5P aluminum radiator features fully aluminum construction, professionally fabricated with stunning TIG welds. This durable aluminum construction improves strength and works alongside our strategic core design to provide superior heat dissipation. Our radiator's core offers a 25-percent increase in coolant capacity and a 14-percent increase in total core volume for additional cooling capacity. The Mishimoto radiator fits 2017-2019 L5P Duramax equipped vehicles with just minor trimming of the radiator fan shroud to accommodate our thicker core. We've also included a Mishimoto Magnetic Drain Plug to aid in capturing any metallic debris in your coolant, further extending the life of all the components in your cooling system. Like all our Duramax products, this radiator includes the Mishimoto Lifetime Warranty for a lifetime of performance.

Purchase Includes

Mishimoto Radiator-- Fan Shroud Patch Panel--(5) Tree Clips--(2) Washers--(2) M4X.7 X 16mm Bolts--(2) M6X1.0 X 16mm Bolts-- Quick Disconnect O-Ring


Requires minor trimming of the radiator fan shroud. Instructions and patch panel included
More Information
Overall Height (in)29.29
Overall Length (in)44.37
Overall Width (in)5.41
Core Length (in)33.45
Core Height (in)28.58
Fluid Capacity (gal)2.61
Inlet (in)2
Core Thickness (in)2.67
ApplicationsGMC Sierra 2500HD V8 (6.6L Diesel) 2017-2019--GMC Sierra 3500HD V8 (6.6L Diesel) 2017-2019--Chevrolet Silverado 2500HD V8 (6.6L Diesel) 2017-2019--Chevrolet Silverado 3500HD V8 (6.6L Diesel) 2017-2019
Engine CodesL5P
Chassis CodesGMT K2
NoteRequires minor trimming of the radiator fan shroud. Instructions and patch panel included
Coolant Capacity2.61 Gallons
Download Installation Guide
(Size: 10.6 MB)
Installation Guides

Mishimoto Automotive (“Mishimoto”) warrants its products under this lifetime limited warranty policy (“Warranty Policy”). This Warranty Policy applies solely to: (i) Mishimoto Products purchased directly from Mishimoto or Mishimoto authorized dealers (each a “Mishimoto Product” and collectively, the “Mishimoto Products”) and (ii) the original purchaser of such Mishimoto Product (“Purchaser”). This Warranty Policy is non-transferable and all claims under this Warranty Policy must be accompanied by the original sales receipt. The terms and conditions of this Warranty Policy are subject to change by Mishimoto at any time without notice.

For our complete warranty policy, please click here.