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So a couple weeks ago I went to get an oil change from the dealership , when I was done there was a check mark on the transmission section in which they stated there was a possible leakage underneath but there weren’t exactly sure what kind of fluid it actually is but if I wanted to make sure I had to pay $200 for a diagnostic. But it was marked saying it wasn’t a big deal just keep an eye on it, but I needed to change my battery and brake light asap (both working fine). So I thought it was a gimmick , so when I came home I checked under the car and it was extremely wet with oil and I thought they might have just spilled something. Couple weeks now and it still looks wet , I checked the dip stick and there’s oil in it . But here’s some pictures
You checked the transmission fluid and it isn't low? If this is a regular automatic transmission there's usually a special procedure to check the level not see if the dipstick is wet. You didn't tell us what you have though so we can't tell you how to check it.