For about 5 weeks, I have found a clear oily liquid seeping up through our garage floor. Not due to flooding as it hasn't rained here in a month. It gathers in one spot and never exceeds the size of a garbage can lid. It is not not near a wall or any water or drain pipe. The floor is about 15 years old, very smooth concrete- no cracks. We are second owners so not sure about composition of floor. Had a contractor/plumber look. He had never seen anything like it and couldn't determine a source since it was clearly not condensation- didn't think it was water. Any thoughts on what this is would be appreciated. I don't even know who to call.


