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Probably transmission fluid, it's basically oil too. You should get an idea from which side it is, engine is on the right, transmission is on the left. Lay down a sheet of cardboard and check it the next morning so that there will be only one mark. If you use white paper you should be able to detect color. Automatic transmission fluid and coolant both have distinct color. Manual transmission fluid, engine oil, and brake fluid are all the color of beer.
If that's a year's worth of drippage then it's nothing to worry about.
Alcohol, Tobacco, and Firearms
Should be a convenience store, not a government agency
If you have an AWD model, I would have someone check the transfer case and rear differential fluid levels. Those hold less than a quart of gear oil each, so a very small leak (such as you appear to have) can become problematic before you realize something is wrong