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Derale Combination Transmission/Engine Oil Cooler Core - 13-15/16" x 10-1/4" x 3/4"

Derale Combination Transmission/Engine Oil Cooler Core - 13-15/16" x 10-1/4" x 3/4"

Item # D15321
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Derale Combination Transmission/Engine Oil Cooler Core - 13-15/16" x 10-1/4" x 3/4" Core D15321
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Efficient tube-fin core merges a 4-pass engine oil cooler with a 4-pass transmission fluid cooler for maximum benefit. Intended as replacement core for Derale combination transmission and engine oil cooler systems. Call 800-298-8924 to order Derale accessories and parts part number D15321 or order online at etrailer.com. Free expert support on all Derale products. Guaranteed Lowest Price and Fastest Shipping for Derale Combination Transmission/Engine Oil Cooler Core - 13-15/16" x 10-1/4" x 3/4". Accessories and Parts reviews from real customers.
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Derale Accessories and Parts - D15321

  • Transmission Coolers
  • Engine Oil Coolers
  • Core
  • Derale

Efficient tube-fin core merges a 4-pass engine oil cooler with a 4-pass transmission fluid cooler for maximum benefit. Intended as replacement core for Derale combination transmission and engine oil cooler systems.


  • Can be used with any 2 automotive systems - transmissions, engines, fuel or power steering systems
    • Fluids flow through separate tubes inside the same core for effective, simultaneous cooling
  • Lowers fluid temperatures with heat-exchanging tube-fin construction
  • Designed with copper tubing expanded into aluminum fins for maximum heat transfer
    • Copper is the best material for conducting heat from the fluid, and aluminum is ideal for transferring and dissipating that heat
  • Protected from possible damage during installation by plastic fin guards
  • Functions as replacement part for Derale Electra-Cool dual-circuit, remote-mount cooler (D15220)
  • Made in USA


  • Inlets: -8 AN
  • Overall dimensions: 13-15/16" wide x 10-1/4" tall x 3/4" deep
  • Core length: 9-5/8"
  • Distance between inlets: 3-3/4"
  • 1-Year warranty

Perhaps the simplest type of heat exchanger, the tube-fin effectively cools a variety of automotive systems. The concept is simple: Fluid cools as it travels through the core by transferring heat out to the fins. The fins then provide the surface area necessary for sufficient heat exchange to take place, allowing the heat pulled from the fluid to dissipate into the surrounding air. Add to that Derale's unique turbulator technology - whereby fluids are agitated continuously to not only facilitate heat transfer, but also to prevent any undesirable drop in pressure - and you have an easy and effective cooling system.


15321 Derale 4 Pass Dual Circuit Cooler with -8 AN Fittings


Ask the Experts about this Derale Accessories and Parts

  • Wiring Harness and Coolers for Towing with 2016 Honda Odyssey SE
    For a 4-pole flat type wiring harness to go along with the hitch on your 2016 Honda Odyssey SE you can use the Tow Ready # 118521. This is a custom-fit powered taillight converter that will protect your Odyssey's wiring from any faults or shorts in the trailer wiring by isolating the vehicle wiring. It will not interfere with your factory-installed vacuum. I would select your harness based on the amperage (current) requirements of your trailer lights. The Tow Ready's output is 4.2-amps...
    view full answer...
  • Towing Capacity for 2015 Dodge Durango AWD without Factory Tow Package
    I took a look at the owner's manual for your 2015 Dodge Durango AWD and did see that for the Light Duty model, the maximum trailer weight is 3,500 lbs and the maximum tongue weight is 350 lbs. Unfortunately, the overall rating of a towing setup will always be limited by its weakest component. In this case, you will have to go by your vehicle's weight capacity regardless of the installed trailer hitch rating. Considering that the dry weight of your trailer is already at your vehicle's...
    view full answer...
  • Pressure Rating for the Derale D15321 Transmission Cooler
    All of the Derale transmission coolers, fittings and hoses that we carry are tested for use up to 300 psi. This includes the Derale Cooler part # D15321.
    view full answer...
  • Transmission and Power Steering Cooler Recommendation for a 2005 Honda Odyssey
    Since you are planning on buying a transmission cooler like the Derale Transmission Cooler, part # D13502, I would consider purchasing the Derale Combination Cooler Core, part # D15321. This cooler can be used for cooling both the transmission fluid and the power steering fluid on your vehicle in one compact package, see photo at right. You will need to measure to decide if you will be able to mount the transmission cooler first. The dimensions of the Derale Combination Cooler Core are...
    view full answer...
  • Can Combination Cooler be Used to Cool Power Steering and Transmission Fluids on 2002 Honda Odyssey
    The Derale combination cooler # D15321 can be used to cool any two fluids you want; oil and transmission, oil and power steering, or transmission and power steering. If you use it to cool the engine oil then you will also need a remote oil cooler install kit, # D15751. If you do not have a lot of room to place a large combination cooler you can get separate coolers for the transmission and power steering pump. The most popular option for a transmission cooler for your 2003 Honda...
    view full answer...

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Info for this part was:

Updated by:
DeAnne T
Updated by:
Adele M
Updated by:
Daron K
Expert Research:
Adam R

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