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  4. With 11/32 Inch Hose Barb Inlets
  5. 17W x 12-1/2T x 3/4D Inch
  6. Standard Mount
Derale Combination Transmission and Engine Oil Cooler with Multiple Threads

Derale Combination Transmission and Engine Oil Cooler with Multiple Threads

Item # D15902
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Transmission Coolers
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Derale Transmission Coolers - D15902
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17" Wide x 12-1/2" tall x 3/4" deep, tube-fin cooler improves your vehicle's overall performance by ensuring proper fluid temperatures for both its engine and transmission with one compact system. Lowest Prices for the best transmission coolers from Derale. Derale Combination Transmission and Engine Oil Cooler with Multiple Threads part number D15902 can be ordered online at or call 800-298-1624 for expert service.
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  • Reviews (14)
  • Q & A (0)
  • Photos
  • Why etrailer?

Derale Transmission Coolers - D15902

  • Transmission and Engine Cooler
  • With 11/32 Inch Hose Barb Inlets
  • 17W x 12-1/2T x 3/4D Inch
  • Standard Mount
  • Derale

17" Wide x 12-1/2" tall x 3/4" deep, tube-fin cooler improves your vehicle's overall performance by ensuring proper fluid temperatures for both its engine and transmission with one compact system.


  • Keeps both engine and transmission cool with just 1 system
    • Engine oil and transmission fluid flow through separate tubes inside the same core for effective, simultaneous cooling
  • Improves functioning and overall performance of transmission and engine
  • Extends life of both transmission and engine and prolongs period between necessary fluid changes
  • Cuts down on heat-related failures
  • Designed with copper tubing expanded into aluminum fins for maximum heat transfer
    • Copper is the best material for conducting the heat out of the fluid while aluminum is ideal for transferring and dissipating that heat
  • Protected from possible damage during installation by plastic fin guards and powder coat finish
  • Includes:
    • Universal thermostatic sandwich adapter to provide external oil lines
    • Multiple sleeve nuts to ensure proper thread size
    • High-temperature, OEM spec hose with stainless steel clamps
    • Nylon mounting rods with pads
    • Bendable, metal mounting brackets
    • Insta-dapt radiator adapter
    • All necessary hardware
  • Made in USA


  • Dimensions: 17" wide x 12-1/2" tall x 3/4" deep
  • Inlets: 11/32" hose barb
  • Engine filter thread size: 3/4"-16, 13/16"-16, 18 mm x 1.5 mm, 20 mm x 1.5 mm and 22 mm x 1.5 mm
  • Hose lengths:
    • 1/2" Diameter x 10'
    • 11/32" Diameter x 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 the 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.

15902 Derale Universal Combo Transmission and Oil Cooler with Installation Kit

Installation Details D15902 Installation instructions

Customer Reviews

Derale Combination Transmission and Engine Oil Cooler with Multiple Threads - D15902

Average Customer Rating:  4.1 out of 5 stars   (14 Customer Reviews)

17" Wide x 12-1/2" tall x 3/4" deep, tube-fin cooler improves your vehicle's overall performance by ensuring proper fluid temperatures for both its engine and transmission with one compact system.

- D15902

Without a video for my 2014 explorer and with limited written instructions I chose to find a repair shop that would do the installation. It cost me $360 to have the dual cooler installed. Most places won't consider third party parts to install and others that wanted to charge from $600 - $800 to install. Removing the front cowling, bumper, & headlights proved to be too big of a challenge without adequate instructions. Also following the installation I drove cross country pulling a trailer and I didn't trust my self with the work, and at near 70 years I no longer want to tackle such a job. Other than above I made it to California with out incident. PS, it would have been helpful for an estimate of the additional engine oil and transmission fluid it would take to fill the new system.

- D15902

This is a good product and installation was fairly straight forward. The directions do not address the transmission connection to the cooler. If it did, someone would have realized a part was missing from the kit. If you are installing this cooler on a Dodge you will need a different connector than the one provided. Dodge uses a snap in, rather than screw in, connector for the transmission line. I only discovered this by watching a video online which actually gives the Derale part number for the connector (I don't remember what it is). I explained this to the customer service agent and he did not believe me nor would he send me one for free. Since I ordered this kit specifically for a Ram I feel this adaptor should have been included in the kit. Disappointed about that, otherwise it seems like a good kit. I haven't tested it yet since I am waiting for the adaptor.

- D15902

I have not had a chance to install this unit yet. From the looks of it though it is worth it. Install should be a breeze too. I purchased this for a 05 Dodge Caravan. It cam with all the different oil filter adapters color coded for the filter you use.

How was the install? Are you happy with it? Any things you wished you knew before you began the install?- thanks. - getting ready to do the same
-- comment by: Chris d - 11/29/2015

- D15902

Easily installed to an 05 town and country. I think the 3/8 compression/ barbed fittings should be included in the kit though. Also do yourself a favor and make sure you get the hoses on the cooler before you tie it in place cause they go on HARD. Otherwise pretty simple. Installing for towing purposes. Took about 1 hour complete.

- D15902

This cooler does a good job keeping transmission oil engine oil cooler.

- D15902

I haven't had the transmission cooler installed yet but the service I received in ordering and the shipping was way above what I ever expected. Very friendly customer reps and they know their job.

- D15902

This kit was easy to install on my application and works very well.

- D15902

I installed the etrailer derale transmission cooler on my 2012 Toyota Tacoma. Hauled home a 3500lb tractor 3000 miles up hilly terrain and had no problems at all. Works great.

- D15902

Everything arrived intact, no damage. Instructions were clear. Products were put on with ease. Thanks

- D15902

Received it packaging was great the cooler was in perfect condition all items seem accounted for. Cant wait to install it.

- D15902

- D15903

Review from a similar Combo Trans and Engine Cooler in Transmission Coolers

The customer service is excellent thanks for the product. It is exactly as on the web site. Installing it on my truck. Honest, honorable people. I will continue to do business with. Thanks again

- D15903

Review from a similar Combo Trans and Engine Cooler in Transmission Coolers

Tranny side had no problems. Oil side kept leaking and was eventually disconnected. Hose clamps for hoses need to be replaced with sealed units.

- D15903

Review from a similar Combo Trans and Engine Cooler in Transmission Coolers

The kit is excellent, with a great price. I haven’t installed it yet. The kit doesn’t include the reducer for the smaller hose. Fast shipping and great support. Detailed Instructions would be extrodinarilly helpful.


Ask the Experts about this Derale Transmission Coolers

  • Recommendation for Transmission Cooler and Engine Oil Cooler for 2007 Dodge Grand Caravan SXT
    Installing a transmission cooler and an oil cooler on your 2007 Dodge Grand Caravan is an excellent idea if you are hauling or towing loads of any amount of weight. It will help keep the temperatures of the fluids down which will help prolong the life of the transmission and engine in your vehicle. It would not be too much for your vehicle. I would recommend the Derale Combination Transmission and Engine Oil Cooler, part # D15902. With this part you will only need to find room to mount...
    view full answer...
  • Combination Transmission and Engine Oil Cooler Recommendation for a 2010 GMC Sierra 1500
    The benefit to a combination cooler like the Derale Transmission and Engine Oil Cooler # D15902 is that it only requires you to mount one cooler instead of two separate ones for the engine oil and transmission fluid. If you plan on installing a transmission and engine oil cooler this is the route I would recommend. This combination cooler comes with multiple oil filter thread options to ensure that it will work on your vehicle. I attached an couple FAQ articles on cooler for you to check...
    view full answer...
  • How to Find the Transmission Fluid Return Hose on a 2006 Toyota Tacoma for a Transmission Cooler
    The easiest way to determine the return line on your 2009 Toyota Tacoma transmission is to start the truck, shift into drive but do not go anywhere. After about 15 seconds or so put the truck back in park and apply the emergency brake. Turn off the truck. Out of the 2 hoses attached to the transmission, one should be warmer than the other. The one that is cooler is the return line. It may sound a little too easy but it works.
    view full answer...
  • Tips for Putting a Hose on the Hose Barbs on a Derale Combination Transmission and Oil Cooler
    In order to work the hose onto the inlet barbs in the Derale Combination Transmission and Engine Oil Cooler, # D15902, it helps if you use a little transmission fluid (if it is the transmission line) or oil (if it is the oil line) around the inside of the hose and on the inlet. This will lubricate it some and then it is just a matter of a little muscle to wiggle the hose on. I have included a link to a video showing a transmission cooler installation. At the 3:24 mark of the video, our...
    view full answer...
  • Will Derale Combination Transmission and Engine Oil Cooler, # D15902 Fit a 2001 Dodge Ram 1500 5.2L
    The Derale Combination Transmission and Engine Oil Cooler, # D15902, includes numerous thread sizes that one of them will fit your 2001 Dodge Ram 1500 with the 5.2 liter. You can see the different filter thread sizes listed in the specs below the description on the product page. The transmission cooler portion is not vehicle specific so it will fit provided there is space in the engine compartment for the cooler. I have included some links to FAQ articles on transmission and oil coolers...
    view full answer...
  • Installation of Derale Combination Trans/Oil Cooler # D15902 on 2009 Honda Odyssey EX
    Fluid coolers like the Derale Combination Trans/Oil Cooler # D15902 are not vehicle-specific so you can install as large a cooler as you have space available for it. This particular dual-core cooler measures 17-inches wide x 12-1/2-inches tall x 3/4-inch deep. You can check within your engine compartment to verify that there is enough space for the cooler itself and for the connected hoses; it is important that the oil lines not have to make sharp turns that could interfere with the flow...
    view full answer...
  • Would a Transmission Cooler Help a 2009 Dodge Caliber that Whines After Warming Up on Hills
    Transmission coolers do an excellent job keeping the transmission fluid cool to prevent damage from happening, but if your transmission already has problems it won't fix the issue. Your best option would be to take your vehicle to a qualified transmission repair shop and let them diagnose the noise your vehicle has. Once the problem is addressed I would then recommend installing a transmission cooler to prevent future problems as heat is the number one killer of transmissions. The part...
    view full answer...
  • How to Determine Which Transmission Line is the Return Line for Installing a Transmission Cooler
    The method we use to determine the correct line to install a transmission cooler on is pretty simple. You want to install the cooler on the return line. To determine which line is the return line you will want to start with your truck totally cooled off. Start the truck and put it in drive, apply the brakes firmly and then apply the accelerator slightly so that the rpms climb. Put the truck back in park and shut it off. Now go out and feel the two lines leaving the radiator. The cooler...
    view full answer...
  • 2009 Toyota Sienna Combo Transmission & Oil Cooler Recommendation
    As long as you have room for it, the Derale Combination Transmission and Engine Oil Cooler # D15902 would be an excellent choice to keep your engine oil and transmission fluid cool. This kit measures 17" Wide x 12-1/2" tall x 3/4" deep, you will want to measure the area in front of your radiator to determine if you have clearance for it. I attached an install video for you to check out as well. The oil cooler portion of this kit has a thermostat in the sandwich adapter so that your vehicle...
    view full answer...
  • Transmission and Oil Cooler Recommendation and Install 2001 Dodge Ram 1500 5.9L Towing a 24ft Camper
    Transmission and engine oil cooler # D15902 would be a great fit for your 2001 Dodge Ram 1500, towing your 24 foot camper. As far as the cooler installation in relation to your AC condenser, it really depends on how much room you have. You would need to measure, once received, to determine where you are able to mount the unit. It is, of course, best to install the cooler in front of the condenser, because it would function at full efficiency, but it would still be effective if installed...
    view full answer...
  • Recommend a Combination Oil and Transmission Cooler For 2010 GMC Yukon XL Denali
    If you are looking for a combination engine oil and transmission cooler I would recommend the item you selected, Derale Electra-Cool Combo Engine and Transmission Cooler, part # D15902. I contacted our representative at Derale and he informed me that the fittings to hook up to oil line will fit your 2010 Yukon XL Denali. You will want to measure to make sure that there is room to mount part # D15902 in front of your vehicle. The best place for maximum cooling efficiency would be behind...
    view full answer...
  • Does Adding a Transmission Cooler Bypass the Factory Cooler on a 2006 Chevy Silverado
    When installing a transmission cooler like Derale # D15902, it will be installed in line with the factory cooler and not bypass it. As long as you have room somewhere in the engine compartment to mount the cooler, a powered fan cooler probably will not be necessary. There are 3 possible places to mount a cooler. The most efficient place is in front of the A/C condenser core. Next would be between the core and radiator. And the least efficient place is between the radiator and engine. If...
    view full answer...
  • Transmission Cooler and Engine Cooler Recommendation for a 2009 Nissan Frontier
    The part # D15902 that you referenced is designed to cool the transmission fluid and the engine oil of a vehicle it is installed on. It comes with a thermostatic controlled sandwich adapter so that it will allow your vehicle to reach operating temperature. This kit would not tie into your power steering pump or fluid at all as that is a separate system. You will want to connect the transmission cooler downstream of your factory cooler. This will provide you with the best possible cooling...
    view full answer...
  • Locating Transmission Fluid Return Line on 1999 Acura TI
    To determine which line is the return line, you'll want to begin with your 1999 Acura TI being totally cooled off. Next, start the car and put it in drive for about a minute and then put it back in park and shut it off. Now you'll just need to feel the two lines connecting the radiator and transmission. The cooler of the two lines is the return line and the one you would use to install the Derale Combination Transmission and Engine Oil Cooler, # D15902, on.
    view full answer...
  • What is the Towing Capacity of a 2004 GMC Sierra 1500 4x4 with 5.3 Liter Motor
    For a 2004 GMC Sierra 1500 4x4 with the 5.3 liter the towing capacity will be one of the following depending on how your truck is configured: Regular Cab, Long Bed 3.73 rear end, 8,000 4.10 rear end, 9,000 Crew Cab, Long Bed 3.73 rear end, 7,500 pounds 4.10 rear end, 8,500 pounds Extended Cab, Long Bed 3.73 rear end, 7,600 pounds 4.10 rear end, 8,600 pounds Regular Cab, Short Bed 3.73 rear end, 8,200 pounds 4.10 rear end, 9,200 pounds Extended Cab, Short Bed 3.73 rear end, 7,800 pounds 4.10...
    view full answer...
  • How Does the Transmission Cooler Portion of D15902 Route to Vehicle
    In the install video for the Combination cooler part # D15902 that you referenced it is used as a transmission and power steering fluid cooler so it does not show it getting attached to the oil filter system. The return line of the factory transmission cooler (radiator port) gets run to the inlet of the Derale cooler and then the outlet of the Derale gets run to the return line of the factory system that runs back to the transmission.
    view full answer...
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  • Will Derale Combination Transmission And Engine Oil Cooler Fit 2014 Ram 1500
    Adding a cooler when towing is an excellent idea. For the greatest cooling efficiency you want to mount the cooler between the grille and the AC condenser on your Ram. I have attached a photo that shows where the best mounting locations are for a cooler. The Derale Combination Transmission and Engine Oil Cooler, part # D15902 measures 17 inches Wide x 12-1/2 inches tall x 3/4 inch deep, so you want to make sure you have the room for installation. I have attached a couple helpful articles...
    view full answer...
    Image 1 for
  • Combination Oil and Transmission Cooler Recommendation for a 1980 Chevy 229 3.8 Liter V6
    The trick to finding the correct oil cooler for a vehicle is to first determine the thread size of the oil filter for the vehicle. Which a 229 3.8 liter V6 engine made by Chevy in 1980 would have M18-1.5 inch threads. The combination cooler part # D15902 comes with the correct thread adapter for your vehicle so it would work well for you.
    view full answer...
  • Combination Oil and Transmission Fluid Cooler Recommendation for a 2007 Toyota Tacoma
    Yes, the oil filter threads that you have on your 2007 Toyota Tacoma are 3/4-16 and the part # D15902 comes with an adapter for that size so it would work well for you.
    view full answer...
  • Towing Capacity for the 2004 Dodge Dakota Quad Cab with 4.7 Liter V8
    For your quad cab 2004 Dodge Dakota with 4 wheel drive and 4.7 liter V8 the towing capacity would be 6,100 lbs. The GCWR for your truck would be right at 10,500 lbs. This rating is the total weight of the truck and trailer combined.
    view full answer...
  • Oil and Transmission Cooler Recommendation for a 2004 Ford F-150 4.6 Liter
    The Derale Combination Transmission and Engine Oil Cooler with Multiple Threads # D15902 will fit your 2004 Ford F-150 with a 4.6 liter engine and comes with everything you would need. This will greatly help reduce the engine oil and transmission fluid temperature so we would recommend it for you. I looked up the threads of your oil filter and they match one of the adapters that comes with this kit. The adapter you would need to use is the 3/4-16 threaded adapter. I attached an install...
    view full answer...
  • Transmission & Oil Cooler Recommendation for 2009 Chevy Silverado 1500 V6
    For a kit confirmed as a fit for your 2009 Chevy Silverado that includes a transmission fluid and an engine oil cooler we have the Derale Combination Cooler part # D15902 which would work well for both. The oil filter portion of the cooler has multiple thread sizes included which will fit your truck as well.
    view full answer...
  • How to Reduce Engine Oil and Transmission Fluid Temperatures While Towing with a 2013 Ford F-150
    When towing a trailer, the vehicle will be working twice as hard as opposed to normal driving conditions and even more so when climbing a hill. The added workload is going to cause a buildup of heat which would affect both performance and wear lift. If the vehicle is as you put "overheating" and you are within the towing capacity of your truck, there is a problem in the cooling/oiling system and you will need to take the vehicle to a shop to have it looked over. However, if the vehicle...
    view full answer...
  • Recommended Transmission Fluid and Engine Oil Cooler for a 2009 Dodge Caliber R/T
    For a transmission fluid and engine oil cooler that will work for your 2009 Dodge Caliber R/T, I recommend the Derale Combination Transmission and Engine Oil Cooler part # D15902. This cooler will do any excellent job of keeping both your engine oil and transmission fluid cool. We have not had a chance to install this cooler on a Dodge Caliber yet but if you take a look at the attached install video, the process will be very similar. The printed install instructions are also attached for...
    view full answer...

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