NC MX-5 Automatic Transmission: Understanding Running Temperature Fill (Quick and Easy)
Okay, so, I got this 2007 MX-5, automatic, you know. I wanted to check the transmission fluid temperature while doing a refill. It’s not rocket science, but it did take some figuring out.
First off, I started the engine. I read somewhere online you gotta ground some connector under the dash while the engine is running. Honestly, it sounded weird but I did just that.

Then, while it was running, I grabbed my infrared thermometer. This thing is a lifesaver, let me tell you. I pointed it right at the transmission oil pan.
The temperature reading is what we are after here. I had read online that the normal operating temperature for these automatics is about 160°F to 200°F (which is like 71°C to 93°C). If it goes above 200°F, you might have a problem.
When the engine’s just cruising, the coolant temperature should be around or under 210°F (100°C), which is fine. The manual also mentioned something about 5-speed and 6-speed transmissions. Mine’s automatic, but good to know, I guess.
So, I kept an eye on the thermometer. It hovered around 180°F, which is pretty good. It means everything is running smoothly. It’s important to check this stuff now and then, keeps things from going south, you know.
I also saw that someone mentioned that the first number in the oil grade, like 5W or 0W, helps with lubrication when you first start the car. Lower is better when it’s cold. Makes sense.

In the end, everything looked good. My transmission temperature was in the normal range. It’s pretty straightforward once you get the hang of it. Just need a thermometer and a bit of patience.
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