Surgery - Colorectal. In brief: Yes, most docs can. Most hemorrhoids should first be treated by conservative measures, such as bulking the stools, education to avoid bad habits like straining, sitting for long periods of time, etc.
Either system will have a burner. 23 years may very well be beyond the typical life expectancy of a oil burner, but a furnace or boiler should last considerably longer than 23 years. The boiler of my house here in MA is 58 years old and still works fine. I am starting to consider replacements, however.
1 Details on typical oil tank life expectancy are at Oil Tank Failure Data but that data is for tanks storing home heating oil, not acidic,corrosive waste oil. 2  The remark you report that the buried oil tank life would be expected to be 80 years because  there is no evaporation  is simply nonsense.