All tanks eventually get moisture in them, and how the moisture is dealt with counts. Ask anyone who has had a 275-gallon tank in their cellar for 20 years if they have ever had to deal with a leak at the bottom of the tank. In some states, anyone living near a public water facility (lake or river) must replace their steel tanks with new polypropylene tanks with an outer steel casing. If I were looking for fuel oil storage that is the only type of tank that I would consider. Most steel tanks leak eventually, and that is why homeowners who have underground tanks are encouraged to remove them and replace them with new containment-type tanks.
I buried a 1,000 underground heating oil tank, and used it for 20 years. Then the county required that I put in an engineered "sniffer well"
They had a Summer kid come around for a few years to use the "sniffer', but that program eventually disappeared.
Natural gas became available, and I switched.
I became concerned that the county was going to eventually require a many $$$ certified tank removal, so I removed the tank, used a Skil saw to cut it up in pieces, and crushed those with my BH.
Took the crushed mess to a construction debris recycling facility, mixed in with a lot of other debris.
Oh,......did I mention,.....when I bought that 1,000 gal. tank,...... I bought a fibreglass tank?
Figured that some day I actually might need to dispose of it!