Looking around the basement the other day, I noticed a small stub of a flexible 3/8" OD copper pipe peeking up from the concrete floor (it is in the area where I believe the old boiler was from long before we bought the house).
The inside of the pipe smelled of oil/grease and when I stuck a stiff wire down the pipe it seemed to run at least 2 feet horizontally just below the cement surface. Pulling back the wire, it was covered with an oily/greasy residue.
Does this signal that there was oil heat at some time or worse, the presence of an old underground oil tank beneath the basement? If not, what else could this small diameter pipe have been used for?
We have no other evidence of there ever being oil heat or oil tanks in our house.