"46erjoe" wrote in message
...
Getting ready to sell an old house. It used to be heated by fuel oil.
Now it's gas forced air, but the old 100 gallon tank remains in the
dirt basement. (At least I think it's 100 gallon - I don't know how to
measure volume in an oval container.)

My realtor says I need to remove it. I used a sawzall to open up a
small hole in the top to see how much oil is left inside. I would
guess about 25 gallons.

The oil can be pumped out or drained out. Why not call the local oil
company and ask them? They may have the information you need to do it at
reasonable cost.