It could be transmission fluid. If it only leaks while you're moving, it can blow towards the rear and build up. Alas, very few cars use dipsticks on the transmission anymore. Unless you have one, the dealer will need to check the fluid level. I've seen three vehicles that required a tow due to transmission failure when they sprang a leak in the field. Two needed fluid and one a new unit. With only 1K on the clock, this ought to be under warranty.

 

"Mystery" leak (literally) resolved!
Lesson learned....sometimes a $6.00 bottle of Marvel Mystery Oil can end up costing $64[img]data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7[/img]