Leaking from transmission drain plug

Hello,

Just to make sure, have you used a new crush washer when you put back the drain plug?
If not that could be the reason it is leaking. It can also leak if somehow the treads get crossed. The plug should be torqued at 29 ft. lbs.

https://www.2carpros.com/articles/how-to-service-an-automatic-transmission

Please let me know of any questions.

Thank you.

Did you get a new crush washer with the drain plug?

That is strange. As if you use a new crush washer and a plug that has the correct style and flange, with the right torque it should not leak. I could not tell from the video, but if the mounting surface of the pan is not smooth it can leak even with doing everything correctly.
The drain plug you got from O'reillys was it a factory style plug?

Sometimes aftermarket components just does not work well as a replacement.
It could that the flange style is ever so slightly different that is triggering the leak. As you know there is not much to that plug besides the washer.
I am not saying that is what happened, but it is a possibility.

Did you have any leaking issue before changing out the drain plug?
If not you might want to put back the original plug with a new crush washer.

Simply put the manufacturer for the plug that you have purchase from O'reillys is different than the manufacturer of the plug that was in your vehicle that you took out (given that was a factory plug).
Given they are made by 2 different companies, they will have different tooling and process of manufacturing. Which can create minor differences in the end product. Most of the time that is usually not an issue, but in some cases it can lead to problems. Both of the plug will look same visually but they can have minor differences, especially around the thread and flange area, which can create a leak. As I mentioned before, it does not mean that is why your car is leaking. But it could be a factor.

Hope this helps.

Thanks.

Got it. Well, then it might be an issue with the transmission pan, the opening might be warped ever so slightly that you cannot see it but enough to leak fluid. If the pan has the issue then there is no easy way to fix it besides changing the pan. Unless you use some type of gasket maker around the plug just as a temporary 'fix'.