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  1. Engine Oil Coolers
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  3. Tube-Fin Cooler
  4. W/ Sandwich Adapter
  5. With 1/2 Inch NPT
  6. Class III
Derale Tube-Fin Engine Oil Cooler Kit w/ Sandwich Adapter (13/16-16 Threads) - Class III

Derale Tube-Fin Engine Oil Cooler Kit w/ Sandwich Adapter (13/16-16 Threads) - Class III

Item # D15503
Our Price: $111.07
You Save: $14.85
Engine Oil Coolers
Shipping Weight: 7 lbs
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Engine Oil Coolers D15503 - With 1/2 Inch NPT - Derale
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16-5/8" Wide x 7-5/8" tall x 3/4" deep, efficient, tube-and-fin cooler core comes with a sandwich adapter and all necessary installation hardware, making it easy to prolong the life of your engine and improve its overall performance. 1-800-940-8924 to order Derale engine oil coolers part number D15503 or order online at Free expert support on all Derale products. Great prices and Fastest Shipping for Derale Tube-Fin Engine Oil Cooler Kit w/ Sandwich Adapter (13/16-16 Threads) - Class III. Engine Oil Coolers reviews from real customers.
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  • Reviews (20)
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Derale Engine Oil Coolers - D15503

  • Tube-Fin Cooler
  • W/ Sandwich Adapter
  • With 1/2 Inch NPT
  • Class III
  • Derale
  • 16-5/8W x 7-5/8T x 3/4D Inch

16-5/8" Wide x 7-5/8" tall x 3/4" deep, efficient, tube-and-fin cooler core comes with a sandwich adapter and all necessary installation hardware, making it easy to prolong the life of your engine and improve its overall performance.


  • Prolongs life of engine oil, reducing number of necessary changes
  • Improves overall functioning and performance of engine
  • Reduces oil temperature by as much as 50 degrees
  • Cools effectively through use of tube-fin core
  • Provides external lines, via sandwich adapter, for simple installation of oil cooler without having to reposition oil filter
  • Non-thermostatic unit
  • Includes:
    • Tube-and-fin cooler core
    • Sandwich adapter
    • High-temperature, high-pressure rubber hose with stainless steel clamps
    • Brass hose-barb adapters
    • Complete mounting kit
  • Made in USA


  • Heat exchanger:
    • Dimensions: 16-5/8" wide x 7-5/8" tall x 3/4" deep
    • Distance between inlets: 6-1/4"
    • Core width: 13-7/8"
  • Sandwich adapter:
    • Inlet/Outlet ports: 1/2" NPT
    • O-ring diameter: 3-1/2"
    • Engine filter thread size: 13/16"-16
  • 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. The result is longer-lasting oil and a better-functioning engine.

The sandwich adapter in this kit provides the external oil lines necessary to install a cooler without requiring you to move the factory spin-on oil filter, making it even easier to extend the life of your vehicle's engine. In addition, the thermostatic bypass feature allows oil cooler than 180 degrees to bypass the heat exchanger, so your engine will warm up faster.


15503 Derale Tube and Fin Engine Oil Cooler Kit with Sandwich Adapter, Type C

Installation Details D15503 Installation instructions

Customer Reviews

Derale Tube-Fin Engine Oil Cooler Kit w/ Sandwich Adapter (13/16-16 Threads) - Class III - D15503

Average Customer Rating:  4.4 out of 5 stars   (20 Customer Reviews)

16-5/8" Wide x 7-5/8" tall x 3/4" deep, efficient, tube-and-fin cooler core comes with a sandwich adapter and all necessary installation hardware, making it easy to prolong the life of your engine and improve its overall performance.


This is a quality product and performs great. Installed on a 2012 Toyota Tacoma and had to have some machine work accomplished and a change from the original oil filter. Installation was straight forward after those issues were resolved.


just what i needed easy install nice quality


It has been 1 year now. Here is the story.

Ram 1500 5.7 w/3.92 gears.

Oil temp at speed with no trailer: 224
Oil temp at speed with Springdale Mini RV: 240 (backed off at that point….it would have kept climbing)

After the install:

Oil temp at speed with no trailer: 200ish.
With trailer 210-220

Before I did this, I had to keep it at 55 in the expressway to keep my oil from turning into charcoal. Now I can drive normally. Only at the hottest part of the summer on a long grade did I ever brake 230 and it cooled right back off at the top of the hill.

Also holds about another quart of fluid which I like from a wear/tear perspective.

Even if the temp wasn’t an issue this kit would be worth it to move the oil filter to a non-retarded spot. I opted to go with the frame on the right side. Can change filter from side if wheel is turned. Very nice.


My vehicle is a 2010 Ram 1500 5.7 Hemi 4x4. Overall product is great, those Conti hoses are awesome and little hard to get on lol but only issue I had I couldn’t retain my factory mopar oil filter which isn’t a big deal I got a WIX filter that fit. Thanks for quick shipping and great product! Will be buying a transmission cooler from you soon!


Installed this on my 2012 Jeep Grand Cherokee overland with the hemi as the oil temp was heating up while towing. The install was not fun as I had to remove the front fender, grill and under body shield. Had to relocate oil filter to driver side and as a result, ran out of hose and had go out to buy more. Wish there was a few more feet. I placed oil cooler in front of radiator.

Once installed, oil cooler has worked great as I regularly go off-roading and camping towing a 6k pound trailer. Oil temps stay 20-30 degrees cooler making a huge difference when towing. No issues with the oil cooler after a year of use. Has been a great product, I would recommend it.


Installed this product on my 2013 Ram 5.7 Hemi. Install was simple and straight forward. I hoped there would be improvements in the operating temperature of my engine oil, which there was. Now towing my trailer is no worry about engine oil temp. This cooler works exactly as advertised, and the temp never go above 220. An unexpected result was better gas mileage by almost 2 additional miles per gallon. Also the truck runs much quieter than before and smoother. This noticed by my wife who rides with me always. So I would defiantly call this a win win install and purchase.


It doesn't fit my car even though the website said it would. I had already installed the radiator component before i found the filter adapter didn't fit so i couldn't return the product.


Easy to install but make sure you use quality thread tape. Check for leakage after 300 miles of driving. Then check again.


I purchased this kit 1 year ago for an 08 Toyota Highlander V6 Sport. The vehicle had a small (and I mean small) trans cooler already installed with the sport, but adding this additional cooler gives us the piece of mind an confidence that when either towing or evening just sitting in temps up to 116F at the drive through in SoCal during summer hours, my family will stay cool. The fans run less and the whole vehicle runs a bit cooler as well. I have verified this with 3rd party OBD readers, actively watching oil temps both at normal operating temps, hill climbs, towing, and when sitting in extreme heat. IT DOESNT BUDGE! I dont have enough good things to say about this cooler. If youve ever thought about it, you should do it. Very easy to install and it flat out works.


To start I gave the product a good rating only because the kit put together by Derale came with the wrong barb fittings. I called Derale directly and they sent out the right fittings. I have not installed the kit yet but it is well made in the USA. If the kit would of came with the proper barb fitting definitely would of got a excellent rating.


Doesn't take long to install.


Happy to find a system with the adapter. Mounted to my 4runner very easily. Not much confidence in the plastic mounting method will make something else.


Great product. Easy installation.


Bill is very knowledgeable and answered all my questions. Good fella, I can't comment on the product yet because I haven't installed it yet. Thanks Jesse



Product was exactly as advertised. Product was shipped quickly, very happy with service.



Recieved item on time, great quality.




See what our Experts say about this Derale Engine Oil Coolers

  • Does Derale Tube-Fin Engine Oil Cooler Kit # D15503 Have a Thermostat for 180-Degree Bypass
    The Derale oil cooler kit you referenced, their Tube-Fin Engine Oil Cooler # D15503, is a non-thermostatic type. There is no bypass in the sandwich adapter so the cooler will pass engine oil continuously through its tubing. Up to a 50-degree temperature drop is possible depending on the exact installation position. I have linked the written installation instructions for you.
    view full answer...
  • What Does the Derale Engine Oil Cooler Kit # D15503 Fit
    This product can fit several different engines as long as the threads of the oil filter are 13/16"-16 and the O-ring diameter is right at 3-1/2 inches. We don't have a complete list of all of the vehicles the Derale Tube-Fin Engine Oil Cooler Kit # D15503 would fit.
    view full answer...
  • Engine Oil Cooler Kit for Chevy 5.7L Small Block Engine
    The Derale # D15503 Engine Oil Cooler isn't a vehicle specific item. As long as your small block 350 uses an oil filter with 13/16-16 threads with a 3-1/2 inch diameter o-ring, and you have the available space to mount the 16-5/8" wide x 7-5/8" tall x 3/4" deep heat exchanger in front of the radiator, the kit will be an excellent choice. I've linked you to our FAQ article about engine oil coolers.
    view full answer...
  • Tube-Fin Oil Cooler Kit with 2-1/2" O-Ring for Yanmar 1500 Tractor
    The Derale Tube-Fin Engine Oil Cooler Kit # D15503 that you referenced has an O-Ring diameter of 3-1/2". For a cooler with a 2-1/2" O-Ring diameter you want the Kit # D15551 instead which has the exact same dimensions as the one that you referenced and is a Class III Tube-Fin style oil cooler. I have attached the installation instructions for you to check out as well.
    view full answer...
  • Combination Engine Oil and Transmission Fluid Cooler Recommendation for a 2009 Toyota Tacoma V6
    Since you are looking for both a transmission cooler and an engine oil cooler I would recommend you consider getting a combination transmission cooler/engine oil cooler. If you use a combination cooler it will help simplify the installation process because it will reduce the amount of coolers that need to be installed. I would recommend you get a Derale Combination Transmission and Engine Oil Cooler # D15902. This is a large enough cooler that you would work well to keep the transmission...
    view full answer...
  • Derale Tube-Fin Engine Oil Cooler Kit # D15503 Recommendation
    The most economically priced engine oil cooler we offer is the Derale Tube-Fin Engine Oil Cooler Kit # D15503, while is more expensive than the Derale Combination Transmission/Engine Oil Cooler # D13302 that you referenced it also includes all of the necessary fittings and adapters to install it on your vehicle that the # D13302 does not. I attached an FAQ article on engine oil coolers for you to check out also.
    view full answer...
  • Engine Oil Cooler Recommendation for a 2011 Toyota Tacoma
    For your 2011 Toyota Tacoma, I recommend the Derale Stacked-Plate Engine Oil Cooler Kit, # D15604. This kit contains o-ring diameter sizes 2-3/4 inches and 2-1/2 inches. These are the most common sizes used on Toyota trucks. It also has multiple filter thread sizes so you will be able to find one that works. The stacked plate design is very efficient and does not take up a lot of space which will increase the places you will be able to mount the cooler. The cooler is 4-9/16 inches tall,...
    view full answer...
  • Recommendation on an Engine Oil Cooler on a 2008 Toyota Tacoma with 4.0 L V6
    I have a solution for you for an engine oil cooler for your 2008 Toyota Tacoma. The Derale Tube-Fin Engine Cooler Kit w/ Adjustable Sandwich Adapter, # D15505, is a tube-fin cooler design that uses the sandwich adapter to connect to the oil filter base on the engine. The kit includes multiple filter sleeve nuts for multiple applications on different vehicles. For your 4.0L V6 on your Toyota, you will need to use the 3/4 inch -16 thread sleeve for your application. For a more higher performance...
    view full answer...
  • Engine Oil Cooler with Thermostat for a 2006 Toyota Tacoma with V6 Motor
    First you would need an engine oil cooler kit. I recommend # D15502 because it comes with multiple thread types and has the proper O-ring size for a V-6 Toyota motor. The sandwich adapter included is thermostatic so a separate thermostat is not required. Oil that is cooler than 180 degrees will bypass the heat exchanger, so your engine will warm up faster. You may need some extra hose like # D15700 for 10 feet. And for hose clamps use # D13008. I have included a couple of links to oil...
    view full answer...

Do you have a question about this Engine Oil Cooler?

Info for this part was:

Employee DeAnne T
Updated by:
DeAnne T
Employee Daron K
Updated by:
Daron K
Employee Michael H
Expert Research:
Michael H
Employee Jameson C
Expert Research:
Jameson C

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