It is indoors, you might be right. The tank might also be from the 1940s for all I know. In Canada, you are supposed to replace the tank every 10 years.
The last time oil was this high, the heating bill was $3800 for the year. At that price the decision is easy.
What could happen is we go into more competition for our natural gas with Europe this winter. For sure the price would be much higher. Luckily (for USA consumers) that the Freeport LNG terminal is off-line..
It's not pretty if the oil tank leaks...
https://www.youtube.com/watch?v=djpH8pUSpjM