Look immediately above the "spot" on the garage floor and see where it's coming from. Then clean everything in that area with carb cleaner, or something like that which will wash away oily residue and dry clean (wear safety glasses!! That stuff BURNS eyes!!). Start the car, bring it up to operating temp, all the while watching for a drip. After it's up to temp, shut it down and again watch for a tell tale drip path. May take a while, but once you find the source of the leak the repair options can be assessed.