Why is there oil on my floorboard?

TrailBeast said
Taste it.
Seriously, if it's coolant it'll be sweet tasting and oil won't be.
just don't swallow any of it. :-)

People think I'm kidding when I tell them that but it sure defines it quick.

Lmao, I have done that, all it takes is just a tap of the finger in it. It's hilarious the looks you get when doing that.