Description
Review this item in the context of the repair, installation access, nearby parts, and the result the completed job is intended to achieve.
This Billet Style Cast Aluminum Fluid Control Thermostat with 1/2 inch NPT ports allows the oil to bypass the cooler until it reaches 180 degree F at which point the internal thermostatic valve will close and force 100 per cent of the oil through the cooler while maintaining a constant pressure system. This process allows the engine/transmission to achieve the ideal operating temperature quicker before passing the oil through the cooler. The unit can be rotated 180 degree to change flow direction. Hardware kit with brass fittings and hose clamps included.
Vehicle information
Available fitment details
Listing compatibility notes
- Hardware kit with brass fittings and hose clamps included.
Fitment data is provided as a buying aid. Verify the listing against your vehicle and existing part before ordering.
Repair scenarios, installation, companion parts, and use outcomes
Buying guidance
Quick decision
Review this thermostats in the context of the repair and the surrounding components.
Repair scenario
- Identify the symptom and confirm that this is the component required by the repair.
- Inspect nearby connectors, fasteners, and mating surfaces before installation.
Installation notes
- Use the listing instructions when present and follow the vehicle service procedure.
- Professional installation may be appropriate when the repair requires special tools or calibration.
Companion parts
- Inspect nearby fasteners, connectors, seals, fluids, and wear items before starting the repair.
- Use the service procedure and the visible package contents to identify any additional parts or tools required.
Before you buy
- Compare the listing title, photos, package contents, and specifications with the part being replaced.
- Confirm vehicle compatibility and installation requirements before ordering.
Customer feedback
Ratings and written reviews
4.4 / 5
33 source ratings
Source: Amazon. Imported marketplace feedback is shown for product research and is not a review of a purchase made on this website.
Good Price!!! –
The add says that I t comes with brass fittings, it comes with 1/2” NPT to 1/2” BARB plastic. I’m not going to use plastic fittings on my 4L80E transmission. I have around $3000.00 and I refuse to use plastic fittings. I ordered BRASS Fittings. Some people think cool fluid is the best way to go. Transmission fluid is meant to be warm and some people even eliminate the stock cooler and the transmission runs cold. Transmissions need to run 200° easy. I’m using it on my 1997 GMC Sonoma and I don’t want the transmission to be too cool. Some people think the cooler the better but I’m not one of them.
G J M –
Used one of these in line on my performance engine in my Volkswagen Beetle. Now the oil gets to temp before it goes to the external oil cooler.
Jonathan V. –
Used this in place of the thermostatic bypass in my oil filter sandwich adapter. Working well so far.No trouble with leaks at the fittings, used ptfe paste on the threads.
Amber Ale –
Normally, I would give the Derale oil thermostat 5 stars since I have used them for over 30 years on high end engines in trucks, cars, and planes (and a few helicopters). No, they’re NOT FAA certified, but I used them since I trust them to always work as designed (with a few motor-head tweaks). Since I have about five of them laying around, I can see that the older units are better made. The castings are cleaner and the NPT threading is much cleaner on Derale thermostats from 5-10 years ago. I actually had a new one leak at the threads recently. A first. It was because of poorly cut port threads.
CJ –
I installed is as part of an auxiliary transmission cooler. It appeared to open and close as designed and kep good flow.The only recommendation I have is to not use the barbed hose fitting and instead use AN fitting to ensure no leaks.
Jay Phelps –
I installed this on a Rotax 9 series engine and after testing found that it was opening at 155F NOT the advertised 180F… My issue is low oil temperatures and long warm up times to get to the minimum 120F operating temp. I wouldn’t recommend this product for Rotax 9 series installations.
Michael L Immell –
Item went in between my engine oil cooler and engine. Engine oil steadily goes up to 180 and stays there. I was skeptical of this item, but it has worked flawlessly for my sbc 350 oil cooler setup.
Joey Ainsle –
exactly how described and expected